Amsterdam park sex. But what if w If visiting in summer, the Openluchttheater, the Vondelpark's open-air theater offers concerts ranging from classical music to world music and cabaret. It includes fields of grass, trees, rose bushes, various ponds, playgrounds, et cetera. More info. It's Official: On warm days Vondelpark is a favorite spot for picnics, barbecues and private parties. This post was last updated: You can also reserve a sauna arrangement in our special VIP room next to which a refreshing sauna with shower cubicle is located.