Tulum is everything you imagine a beach to be; white sand, beautiful water, and incredible sun vistas. The little town of Tulum is not on the beach but a little inland, there are wonderful little roadside eateries featuring ceviche and caught that day fish.
There isn't much night life, and there are no lights allowed on the beach as night because of nesting turtles (!) - but if you can live without late night parties, this is an amazing place. Time really does stop.