Here is where we stayed last year:
http://www.oceanpointresort.com/
Its very comfortable in a safe area, you can walk to restaurants and shopping (across street), its on the beach and best of all they are large condos with full kitchen so you can eat at home when you want. Also we can split rooms to reduce costs as we did last year. They have 1, 2 and 3 bedroom units available.
If you guys want we can price that one again or we can try to stay in South beach, its more pricey there but there is a lot of night life too.