If you're coming for Ultra/WMC then trust me you won't have a hard time finding something to do. Pool parties, clubs, bars, restaurants etc all very easy to find out about. Just ask around and Yelp works too..
Trust me, I've lived here all my life and whenever I go out with friends, especially when it's events, we don't plan anything.
Have fun and be safe, LOTS of stupid shit goes down during this week and COPS EVERYWHERE, UC cops everywhere too, people you wouldn't even expect so just try to stay safe and out of trouble.