Vend apple juice by the litre a Kuerbisegge in Muttenz. Remember your own bottle of flask!
Mathishof has the most amazing, Enter the labyrinth and wind your way through the maize to find 4 or 5 kids play areas that include slides, swings, trampolines and other fun things to play on. Take the zip line through the maze to cut a corner or wander around until you find the exit. The labyrinth is not so complex that you can get lost but you do need a good 30 mins to 1 hour to enjoy it fully. Be warned, I imagine many children could spend a lot longer than that though!