Looking for a family-friendly place to cool down this summer? Check out this list of splash pads and pools. Some parks will even let you bring Fido. A couple of locations require an admission fee.

If your summer looks anything like mine, it’s filled with sunscreen, popsicles, and countless trips to the local splash pad. My kids—ages 6, 3, and 1—live for those water-filled afternoons. And ...