We spent about four hours at the park but we could have stayed there all day. We took along with us a picnic to eat by the lake. If you don’t want to bring your own food, there are plenty of stalls selling food in the same area where they rent out bicycles. The GPS coordinates are 13.813701856482215, 100.55471777915955. Let me know in the comments where your favourite places in Bangkok are for cycling with kids. I might take her next time to Lumpini Park but you are not allowed to cycle at certain times.