I know we've had the debate several times in this forum about whether cruise line shore excursions are a good or bad deal and didn't really start this thread to reopen that debate but wanted instead to ask about what everyone's favorite port of call is and why? What they rated as a top sightseeing experience, independent or cruise line shore excursion, and what made it so memorable for you? Are there off the beaten track spots worth visiting, for example, in the Caribbean and notorious spots to avoid? Do you plan far inadvance or go with the flow when you step off the ship?

I'm curious to hear how everyone who enjoys cruising feels about ports of call so thought I'd seek some input.