Mexico and new Years

So, my sister (and some of her friends) is going to Mexico to celebrate New Years and wants me to go with her. They'll be going to Tulum on the Yucatan Peninsula. They'll be there from Dec. 28 thru Jan. 5th. They have a place that sleeps four for $130 per night, so it would be pretty cheap. Mexico is cheap in general, so I think it would be a fun yet inexpensive way to travel and celebrate the New Year. I haven't decided for sure if I'll go, yet. But it could be cool. Anyone been to Mexico? I haven't ever been.