Universally Well-Known Factoid: You never, ever, ever, forget how to ride a bike. Even a rental bike with a big-butt seat and a big metal basket on the front.
Less Universally Well-Known Factoid: While admiring your pedaling prowess, if you load your basket down with beach towels, new sweatshirts (because I'll be damned if we freeze on that bus on the way back home) flip-flops, the camcorder, goggles, and a bag from the local market with a loaf of bread, a jar of jelly and bananas .... AND you have your camera bag slung across your shoulders with your expensive telephoto lens and external flash inside, you will be so pre-occupied with not biffing it going over any curbs and trashing your camera that you won't even give a second thought to the fact you are riding all over the resort in your bathing suit with your flab bounching and jiggling everywhere. Seriously. Not a thought. Not until you reach your house, safe and sound, camera intact, will the gravity of the situation cross your mind.
Then, you will be mortified to realize the horror and trauma your fat white thighs have unleashed on this innocent seaside community.