KL's sights sit far apart in constant heat, so plan the day around the LRT, MRT and Komuter lines rather than around distance on a map.
Petronas Twin Towers
The Skybridge on level 41 and the observation deck on level 86, entered from the concourse level of Suria KLCC. Tickets are timed and sell out; buy only through the official site — the operator states plainly that it has never authorised any third party to sell admission tickets.
Batu Caves
A limestone cave temple complex on the northern edge of the city, up 272 painted steps beside a gold statue of Murugan. It is the terminus of the KTM Komuter line from KL Sentral, about half an hour; the main cave is free to enter and it is at its most intense during Thaipusam in January or February.
Islamic Arts Museum Malaysia
Twelve permanent galleries covering roughly 1,400 years of art, design and craft across the Islamic world, in Lake Gardens beside the National Mosque. Open 9:30–18:00 daily with last entry at 17:30, and quiet compared with anything in the city centre.
Central Market (Pasar Seni)
An art-deco hall built as a wet market in 1888 and now the city's craft, batik and souvenir market, open daily 10:00–22:00. It sits directly above Pasar Seni LRT station and is a five-minute walk from Chinatown and Merdeka Square.
KL Bird Park
A free-flight walk-in aviary in the Perdana Botanical Gardens holding around 3,000 birds of roughly 200 species, so most of it is birds loose in netted forest rather than in cages. Allow about two hours and combine it with the gardens and the Islamic Arts Museum next door.