Diggers occasionally unearth real diamonds at Crater of Diamonds State Park, the only public diamond mine in the world. It's fitting, since Arkansas is filled with hidden gems of family fun. Rivers like the emerald-green Buffalo National River flow through the Ozarks and the Ouachita National Forest. The bedrock is riddled with colorful caverns; explore show caves like Mystic Caverns near Harrison, or try wild caving at Blanchard Springs Caverns near Mountain View. Springs bubble up all over near Arkansas campgrounds and RV parks, drawing soakers to spots like Eureka Springs and Hot Springs, where you can enjoy an affordable vacation camping in a tent, cabin or RV.