Belmopan is the smallest capital city in the world. Therefore, there is not much to do in this nice, quiet town.
A few little resturaunts and a grocery store. There are many stand alone shops near the bus station selling food, clothes, and pretty much anything else.
There is a nice pizza shop though, and close by, on the western highway, is Guanacaste Natl Park, with a river to cool off in, and a HUGE ficus tree!