I went for my senior trip and was blowing through an EASY $150 a day. It's expensive, but fun. See if you can get with a travel company of some sort.. their packages can save you some money. When I went, we all got a "party pass" which gave us at least 3 free drinks per night, and 2 nights we had open bar. They also had a ruins/sightseeing package, but we weren't interested cause we were there to party lol.