Het Blauwe Theehuis is the main place to get a wine or beer on a sunny day in the Vondelpark. With 700 seats, this is the biggest terrace in Amsterdam.
In the middle of the Vondelpark this place is not only a terrace for summer days. Het Blauwe Theehuis also serves a pretty good lunch and dinner, and, at night it can get quite funky in here. Look at their facebook page for the party agenda.
If you are sunbathing or hanging elsewhere in the park, this is probably the best place to have a legal pee.
Mon-Tu: 09:00-18:00
Sa-Fr: 09:00-21:00