This is Playa del Carmen. I lived here for about six months, it's in the Mayan Riviera. If you like the beach, sun and to have some really good and colorfull cocktails, this is a good place to visit. La Vagabunda is a cute Restaurant whit a lot of wonderful dishes, I used to go there often while I was living there and it's not very expensive.
If you want to go dancing while enjoying a show, then you must go to Coco Bongo.
Near Playa del Carmen there's Akumal, which is a very beautiful and peaceful place if you like, you can sign up for the turtles release.
If you like swimming and snorkeling this is a great place to go to. Besides, the Cenotes are a good idea for an adventure outdoors with a lot of fun.