Although I've never been to Riu, just from reading threads on this forum, I think it may be a better choice for you if you want to party. Dreams has a good mixture of age groups, but mostly families and couples. When we were there earlier this month, there was a wedding w/ over 100 people in attendance, most of them were in their 20s, early 30s. We knew something was going on, b/c the vibe changed...but it was a good thing, they were fun! Dreams also has a nightly excursion to the clubs at night. of course I'm partial, since I chose Dreams, but I loved that resort. The weddings I saw there were well put together and organized. The grounds are beautiful. The food was pretty good for an AI. I din't feel like I was surrounded by spring-breakers, nor did I feel that it was too stuffy to have fun. Some of my guests are planning to party, as are we, and I don't think it's too much of a problem. Just my thoughts...I hope this helps.