Cabo San Lucas, Baja California Sur, Mexico
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Free, Popular with locals, Family-friendly

One thing not to miss in Los Cabos is El Arco, a natural arch rock formation at the tip of the Baja Peninsula. To visit the iconic spot where sea lions bask in the sun, you must go by boat. You can hire a water taxi or sign up for a glass-bottom boat ride at the Cabo San Lucas Marina. (Or sail your own yacht, if you’re so lucky.)