Frolic on the sand at a local beach. Whether you live by an ocean or a lake, take a blanket and a picnic lunch for a guaranteed fun time. Play touch football near the water, and talk about your favorite summer vacation trips. If you're really getting along, let him reapply sunscreen to your back later in the day.
Smell the roses at a botanical garden. Wind your way through manicured lawns and groves of blossoming trees, taking the time to sit near the fountains. Sip cups of tea at the outdoor café, and enjoy the romantic scenery.