Gangaramaya Buddhist Temple

Although it burned down many times over the centuries, including once during the Battle of Sekigahara that devastated Kyoto, it has since been rebuilt and has long enjoyed popularity as one of Kyoto’s major Zen temples.
The temple is built in a magnificent architectural style and taking a stroll around the temple while taking in the spirituality of the place is one of the most amazing things to do for couples in Colombo. The place is now recognized internationally as a place where people can experience nature and nature's cycles through meditation and relaxation.
Location: 61 Sri Jinarathana Rd, Colombo 00200, Sri Lanka
Timings: 6 AM to 10 PM
Do Checkout: Sri Lanka Tours
Mount Lavinia Beach

You can also take a horseback ride from the stable at the Lighthouse intersection, or rent a boat from Mount Lavinia Lake and row through the Koggala Lagoon's backwaters. There are several hotels and guest homes in the region where you can stay if you're looking for some quiet place while visiting Sri Lanka's lovely shoreline which makes it one of the greatest places to visit in Colombo for couples.
Location: Mount Lavinia Beach, Dehiwala-Mount Lavinia 10370, Sri Lanka
Also Checkout: Sri Lanka Tour Packages for Couple
Independence Square

Boasting a location on Rajarata Road near Old Parliament Building's eastern wing - with its imposing front gates - the landmark today stands as a testament to British influence not only on Sri Lankan culture during this period but also as a legacy that entangles modern Sri Lanka with one of its most recognizable symbols.
Location: Colombo 00700, Sri Lanka
Dutch Hospital Shopping Precinct

Colombo's Dutch Hospital Shopping Precinct is home to a range of stylish boutiques and cafés that offer everything from clothes and accessories to souvenirs and beer – all within meters of one another. There are also plenty of activities available in the area and taking a stroll here is one of the most fantastic things to do for couples in Colombo.
The place is perfect for shoppers looking for a break from the retail therapy, such as stretching exercises at Yoga Zone Studio, or browsing through Central Bank’s numismatic collection at its Money Museum.
Location: Hospital St, Colombo 00100, Sri Lanka
Timings: 10 AM to 10 PM
Beira Lake

It also has different water sport facilities like sailboats and pedal boats. Beira Lake is not only a great destination to visit but also good for its surroundings because you can easily visit many other attractions nearby like Galle Fort, Deodar Caves, Lighthouse Point, Kynance Cove and many more.
Location: Colombo, Sri Lanka
Timings: 7 AM to 6 PM
Uppuveli

According to tradition it is where Shiva bathed while he smeared his body with ashes from his wife's pyre. The beach is a popular destination for both picnic and weekend getaways. It is a beautiful place to spend your holidays in Sri Lanka and the beach is loved for its golden sand, two resort hotels, and plenty of restaurants where you can try delicious local cuisines. It’s the perfect place to spend a getaway with your partner which makes it one of the most romantic places in Colombo.
Location: Trincomalee District, Sri Lanka
Independence Memorial Hall

It is modelled on the Parliament House of Australia under the guidance and supervision of Prime Minister D.S Senanayake in 1947. The place has 2 floors covering an area over 1 acre with a dome measuring 50 feet from ground level at its highest point, tapering uniformly to its apex 30 feet from ground level. Visiting the memorial hall is one of the most interesting things to do for couples in Colombo.
Location: WV38+WV4, Colombo 00700, Sri Lanka
Nilaveli
Beautiful scenery and unique architecture make the village purely astounding and one of the most romantic places in Colombo. Many historic fishing boats dot the shoreline of nilaveli and some of them date back hundreds of years but still continue to provide a steady supply of fish to villagers and traders alike. Fishermen can also be found repairing nets on roadside rocks, catching octopuses at sea, or drying shrimp by the water's edge.
Location: 16 kms northwest of Trincomalee, Sri Lanka
Seema Malakaya Temple

It was constructed between 100-300 AD with a second temple built on it during the 16th century. The temple comprises two main shrines which are shared between the members respectively and is an amazing place to visit in Colombo for couples.
It also contains a chamber that contains a small Buddha statue, three Bodhi trees and a shrine dedicated to Lord Shiva. There are four different entrances that lead into this complex, each having its own charm and elegance.
Location: Sir James Pieris Mawatha, Colombo, Sri Lanka
Galle Face Green

The park includes an amphitheatre that has hosted numerous events, including a concert by John Lennon on August 15, 1972, and numerous open-air concerts by local performers. The Colombo City Zoo was relocated to Galle Face from its old location at Rosmead Place.
Location: 56 Colombo - Galle Main Rd, Colombo, Sri Lanka
Colombo Fort

The fort is now one of three national monuments protected by Sri Lanka's Department of Archeology, with its vast gunpowder storage, noteworthy 18th-century mural paintings, and well-preserved ramparts among its best characteristics.
Since 1992, the fort has been home to an arts centre that has hosted exhibitions on Portuguese and Dutch colonial history as well as modern art and visiting the place is one of the most interesting things to do for couples in Colombo.
Location: Colombo district, Sri Lanka
Pigeons Island

The island has lovely and vibrant shopping markets as well as several restaurants and cafes that serve traditional cuisines of the place. The beautiful island is situated in Matugama Bay which is about 2 kilometers from Kollupitiya junction, at Colombo's southern periphery. The area once served as a harbour for merchant ships and tourists visiting Pigeons Island could walk across Matugama Bridge to reach it.
Taprobane Island

Visitors can spend up to 2 hours exploring the island’s wildlife, the beautiful sea as well as the weather and various features, including its rocky terrain and mangrove forests. There are no shops or cafes on Taprobane Island, but there are benches for taking a break if you need it! There are also some shady trees where visitors can escape from Sri Lanka's hot weather.
Location: 23 Upper Dickson Rd, Galle 80000, Sri Lanka
Pettah Market

Pettah means "market" in Sinhala, and the market first opened in 1778, however, due to the city's rapid growth, it has moved several times since then. The items on this site are of good quality and are priced reasonably and affordably. The market is open all day and is a fantastic place to visit in Colombo for couples willing to enjoy shopping and buying some lovely souvenirs.
Location: W E Bastian Mawatha, Colombo, Sri Lanka
Timings: 7 AM to 9 PM, on all days except Sunday