Having interned in SF last summer, I would definitely recommend that you take as much time as you can to meet other people, especially those outside your company. The best way to do that is to join the "201X Bay Area Summer Interns" facebook group. I was in the 2013 one and there were almost 5000 members. Every day people were posting with what they were up to and looking for people to join them. Its a great way to meet other interns and experience all of the things that can be done in the bay area.