Do you have to have a reservation to have a birthday party at one of the pavilions

Not sure. I would call 1st.

Only if they are all full. They are first come first served unless they are reserved.

1808 E Central Boulevard Orlando, FL 32803 Park Hours 5 a.m. – sunset Park Reservations 407.246.2283 Neighborhood Center Reservations 407.246.4464 Pavilions of various sizes, a gazebo and neighborhood center can be reserved for birthday parties, picnics, weddings and more.