We only have a small yard - it's paved - we have nothing out there for the DCs except a couple of balls. I do try to grow some things in pots too!
I am thinking of getting them a wobl board but DS has ADHD and needs to be moving a lot, there isn't room for them to ride their bikes, and I'm not sure we could attach anything to the walls.
Can they use a wobl board outside?
We definitely don't have room for a trampoline. I don't think they'd find the kind of trampoline that has a bar (a trampette?) that engaging for very long and it would take the whole space, I imagine, so unless it can be folded away it would get in the way of putting the bins out etc.