I have never been to New York but I think that what Central Park is for NY, Stromovka park is for Prague.
Stromovka is a wonderful place to spend a sunny weekend with friends or all by yourself. It is like a little green heaven inside Prague. You can play various games, ride a horse, ride a bike, skateboard or roller-skates, rest on the grass, under a tree, near a pond, near a fountain. You can do anything what would charge your inner energy.
There's are a lot of foreigners spending their time in Stromovka. It's partly because Stromovka is close to Letna and a lot of foreigners lives at Letna :)