On the beach! Yes!
We walked from South Inlet Park in Boca Raton, where our towels waited for us, down to Deerfield Pier, where we could go into a restaurant in bare feet and buy cold liters of water.
Even along the water, the sand wasn't very firm, and we postholed the whole way, using lots of unaccustomed muscles and picking up pretty shells.
2.2 miles. Plus swimming!