For a change of scenery, consider a day trip to Ayutthaya, the ancient capital of Thailand, located about 80 kilometres north of Bangkok. You can reach it by train or minivan in just over an hour, where you'll find impressive ruins and historic temples. Another option is the Maeklong Railway Market, where you can see trains pass through a market that operates right on the tracks, about an hour from the city.
For beach lovers, Hua Hin is about 2.5 hours away by car, offering sandy shores and a relaxed atmosphere.