One of our absolutely favorite weekend activities when the weather is nice is to ride our bikes to the best park in the neighborhood. Its even More fun when we have friends meet us there. Even in the winter we will do this (usually not with the bike rides though) and instead of bike rides there we will stop for coffee and donuts. Its a win win, kids play, the parents get to socialize, kids wear each other out... its perfect. And with busy families its really the only way we can all get together anymore.
A couple of weekends ago we had Linnea and her husband and kiddo meet us at the park. The babies played together, my big kids played with their baby (because its obviously more fun playing with someone else's 1 year old even if you live with one..) the husbands talked (probably work stuff and other equally boring man talk..sorry guys) and the moms took pictures and forced our husband to take our picture, because thats what we do.