Chong Nonsi Skywalk

This isn't an attraction so much as a footbridge that people started photographing. It runs above North Sathon Road in Si Lom, part of the elevated walkway network hanging off the BTS, and it exists to get office workers from the station to their building without crossing eight lanes of traffic. The reason it ends up on itineraries is the view down the road, with towers on both sides, headlights streaming underneath, and nothing between you and it but a railing.

Go at dusk if photography is the point. Traffic is thick, the lights come on, and the whole corridor lines up nicely. Go mid-morning or early afternoon on a weekday if you'd rather not be shoulder to shoulder with commuters. Either way it's a ten-minute stop, not an afternoon. Fold it into a Si Lom walk and carry on to the bars and restaurants nearby.