Gravity St Johns is a trampoline park at 77B Morrin Road in Saint Johns Park, Auckland, rated 4.4 from 968 Google reviews, with visitors singling out the ninja course, dodgeball, foam pit and plenty of jumping room, plus refreshments on sale and seating where parents can watch. Families often mention it for kids' birthday parties.
Trampoline parks run on timed sessions, and regulars book ahead because weekends and school holidays fill fast. Grip socks are the norm at most parks, both for traction and hygiene, and younger children usually do best in dedicated junior sessions away from older, faster jumpers. It is worth checking age or height rules for particular attractions before you arrive, and expecting an hour of bouncing to tire children out more than you might think.
For families around Saint Johns Park and the wider Auckland area, Gravity is a well-reviewed place to let the kids burn off energy for an afternoon.