I've mentioned before that our street has a veritable posse of kids in the same age range(s) as our kids, and they all like to play together.
Elizabeth and Matthew especially have spent many a fall afternoon after school bouncing on Simon, Martin and Oliver's trampoline. Amelia likes the trampoline too, but doesn't get too many chances because she's too little to go on at the same time as the "big kids". Luckily they have her favourite toy. So it's a pretty popular place. When they get tired of the trampoline, they bike, run or scooter to our place a couple doors down and play in the sandbox.
It's a pretty sweet setup.