(Mostly South Austin Recs) Play Street Museum is great, I think parties include 20 kids plus an additional fee for extra kids. My Gym does great parties that have some activities led by their staff. We went to a birthday party at Metz Splash pad in East Austin, it wasn’t super crowded, they had picnic tables for breakfast tacos and the cupcakes. We also like Dick Nichols Park where you can reserve picnic tables and they have a water feature that is simple and perfect for just 3 year olds, also there volleyball courts serve as a massive sand box. Pease Park is also fun and has the option to reserve picnic tables plus they usually have a snow cone cart that does a bubble party and they have a splash pad too.