Phoebe is almost 3, and she has enjoyed finding caches with me since I started (not quite as much as her big sister though).
This is one of her (many) favourite playgrounds. We found this playground while walking the dog, and like her big sister wants a cache of her very own for other people to find.
Bring the kids, enjoy the little walk, and wear them out.
It is a bison tube, so BYO pen.