Relaxing by the water or cruising around on a boat sounds like a perfect day. You don't have to go too far with this list of best beaches in every U.S. State.
AlabamaAlabama has 32 miles of Gulf Coast beaches replete with white sand and warm blue water. However, the gem of the coastline is Dauphin Island Public Beach ($5 per person).
ArizonaArizona has no coastline, but it certainly has sand. Head to Cattail Cove State Park ($10 per vehicle) in Lake Havasu City for sun and swimming with a view of the desert rocks.