The Dawn Princess is a magnificet ship. You will find many things to do on it. My wife and I just returned from the 3/14 sailing out of San Juan last week. She is 21 and I am 23. It was a blast! I highly recommend the Dawn. This was our 3rd cruise with Princess. We have never had any let downs as far as night life or finding anyone our age to have fun with.
I just posted many photos from our Southern Caribbean sailing in the gallery if your interested. You will see many beautiful areas. Don't miss out on this cruise. It's a little more money than Carnival but it's worth it.