Visit Gangaramaya

Visiting this temple is one of the top things to do in Colombo in one day. Gold, stones, elephant ivory, Chinese sculptures, stamps, watches, cameras, photos, coins, and other extremely rare objects from India, Myanmar, China, and Thailand are among the numerous religious artefacts on display at the museum.
Location: 61 Sri Jinarathana Rd, Colombo 00200, Sri Lanka
Timings: 6:00 AM - 10:00 PM
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Pray at Seema Malaka Temple

The edifice's architecture is reminiscent of the Kandyan period. Numerous sitting Buddha sculptures in various mudras may be found on the platforms. A wooden paneled meditation shelter is located on the middle platform. Meditating at this beautiful location is one of the tourist-preferred things to do in Colombo in one day.
Location: Sir James Pieris Mawatha, Colombo, Sri Lanka
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Go to Red Mosque

It's a hybrid architectural style that mixes aspects of local Indo-Islamic and Indian architecture with Gothic revival and Neoclassical styles. It had a capacity of 1,500 worshipers when it was built. However, when expansion construction began, its capacity was raised to 10,000.
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Marvel at Independence Square

The sculpted moonstone and the stone walkway are bordered by small ponds. Architecture is one of the most significant sources for understanding history, which is why it is sometimes referred to as "built heritage." Today, the Square is more than simply a national landmark; it is also a place to rest and take in the beauty of nature while being surrounded by ancient structures.
Location: WV38+PXX, Colombo 00700, Sri Lanka
Relax at Victoria Park

As the scene of a variety of historical events, the location is historically significant. A walk across the groomed turf and paved walkways beneath the canopy of palm groves is one of the recommended things to do in Colombo in one day. The park is bordered by the Nanu Oya river, which contributes to the beauty of this well-kept public park in Sri Lanka.
Location: Colombo 07, Sri Lanka
Timings: 6:00 AM - 6:00 PM
Visit Colombo Lotus Tower

Visiting this tower is a must among the things to do in Colombo in one day. Tourists may visit banquet halls, retail malls, hotels with suites, restaurants, museums, auditoriums, and much more in the tower. At the top, there is a rotating restaurant with a beautiful view of the city.
Location: Colombo, Sri Lanka
Explore Dutch Hospital

The Ministry of Crab, Colombo Fort Café, and Spa Ceylon are among the tempting dining choices within the Old Dutch Hospital's ancient walls. The structure is divided into two floors and has five wings that form two courtyards.
Location: Hospital St, Colombo 00100, Sri Lanka
Timings: 10:00 AM - 10:00 PM
Dine in at Vistas Skybar

With fusion and cocktail shishas bringing the shisha smoking experience to a whole new level. Add this experience in your list of things to do in Colombo in one day. From June through September, Vista Sky Bar is open on weekends, holidays, and Tuesdays.
Location: No 24 Srimath Anagarika Dharmapala Mawatha, Colombo, Sri Lanka
Timings: 5:30 PM - 12:00 PM
Spend your Evening at Galle Face Green

There are no entrance fees and the beach is accessible all year. From 9 a.m. to 6 p.m., the optimum time to visit the beach. It is advisable to go about 4 p.m. to catch the sunset and work up an appetite for the delicious cuisine at the night market.
Location: 56 Colombo - Galle Main Rd, Colombo, Sri Lanka
Shopping at Pettah Market

Take a tuk-tuk or cab to the end of the market district and then wander through the alleys to find hidden gems among the little street stores. On weekends, you'll have to prepare for the crowd. While looking for anything of interest, one might get a good deal on clothes and other items.
Location: Keyzer St, Colombo, Sri Lanka