Mexico
Nearest town to the ruins, stay the night (very cheap and one nice restaurant) and walk into the ruins in the morning - be the only people there for a few hours before hundreds of coaches arrive (get amazing photos not covered in people!) Get there by bus instead of paying top dollar for a tour.
Puerto Morelos is just outside on Cancun, but a world away. It's a small resort, quite different from package holiday central of Cancun. There's great beaches also - highly recommended.
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