I agree with the other posters- doing a visiting sub-I will give you a chance to work hard/ show the group that you work well; plus, it may give you more exposure to the different residents and attendings.
I did a few visiting sub-I's for surgery last year and I went out and did it without much advice. Here's what I wish I would have known:
1. Does the chairman or program director work as an attending for a particular service? When? For example, if the chairman will be attending a wards team in September, that may be a perfect time to do your AI so he/she will get to know you.
2. When do the school's students try to get LOR's? My medical school began senior year rotations in July so most of us were doing the electives to get letters in July and August. It didn't occur to me that other schools may not begin senior year rotations until September. I did a rotation at one place in September and was paired with 2 other 4th year students from their school who were trying very hard to get good LOR's. In the end, I had a good experience, but I also got about 1/3 as many cases and a whole lot less interaction with attendings than I would have if I was the only 4th year on the team.
3. If you plan on being out of town doing visiting rotations during October, make sure that you have computer access. I did not have a laptop (and was gone during October as well) so I spent a decent amount of time in the town's public library trying to log on to arrange interviews (you will get the majority of invites in October.)
And then there's the obvious- try to get to know as many people as possible, work hard, read up, be polite, let them get to know you. Plus, if you do en elective at USF, enjoy Tampa- it is a great city!
good luck