Log in and create or update your profile including where you will be this summer
You can check and post on message boards for the state where you'll be
It's a great way to connect with other fellow law students for things such as possible shared housing, carpooling, socializing, etc.
Be sure and check the message boards also for potential housing opportunities. For example, I posted one today for Arizona.
Having Fun on the Cheap in Big Cities
This is a great resource from PSLawNet with ideas of things to do in large urban areas. Has 8 areas to choose from.
You can find housing options in multiple ways. One of the best ways is to ask the hiring coordinator where interns typically live. They can usually provide you with local resources. Also, speaking to students who have previously done internships for that employer is also helpful. Here are a few others:
Cheap Living Guides from Harvard Law School
advice on finding housing, how to get around and what to do for fun in 13 areas, both in the U.S. and abroad
Multi-city intern housing site
New York City