Ancient City, Samut Prakan

Massive museum park with stunning architecture! Make sure to set aside a whole day if you want to get the full experience. The self-drive mini-cart is the best way to get around IMO. There are also bikes for rent if you want to burn calories while exploring the park. The guided tours are great but only stop at a few locations. Overall, one of the best experiences in Bangkok for architecture and history buffs. As a bonus, You will also get to see some local wildlife around the park.

Great halfway trip from Bangkok. Very easy to reach. Take the green line to Keha and jump on one of the pick-up taxis waiting at the station (they are marked with a 36 on the roof). The ride to the Ancient City costs 10 Baht. Once at the entrance, tickets are 700 Baht (400 if you have a Thai work permit or driver's license; there seem to be discounted tickets available online as well so that's worth checking out). You can rent an e-bike for 250 Baht (3h, every additional hour costs an extra 100 Baht but 3h is doable even with a coffee break). The park is massive and very well taken care of. Was there on a slightly cloudy Saturday, perfect weather for some sightseeing, still there were very few people in the park. There are small coffee shops and toilets at every corner, super convenient. Lots of great photo stops, history and Thai culture to be explored. Cruising around on an e-bike is great fun. There's a lot to see and only two of the sites were inaccessible due to maintenance work. Once you're done, bring back the scooter and cross the main street via foot bridge on your left so you can wave down one of the pick-up taxis (again, 10 Baht, marked with a 36 on the roof). A great and fun getaway from the city!