Are you applying for fall 2012? If so, visiting the colleges in May is WAY too late. Having been through this process with my own college students, IMHO, you need to:
1. Decide what you want to major in (yes, this might change, but you need to focus your search to colleges that have what you want to study)
2. Find the schools that provide the best program for your chosen major
3. Apply to some schools you know you will get into and some schools that are a "reach." Each application can cost up to $100 so applying to all of the schools on your original list could end up being quite expensive.
4. Wait to hear which colleges accept you
5. File your FAFSA (Free Application for Federal Student Aid) and have it sent to the schools you've been accepted to. ALL schools require the FAFSA to determine how much financial aid they will give you.
6. Once you start hearing from colleges about what financial aid they'll give you, you can determine which ones you can truly afford to attend. It is absolutely true that when schools say they will fulfill all of your financial aid need, part of what they will provide are loans. So you need to know how much debt you can handle upon graduation.
7. Determine which schools you want to visit and make your plan to do so, asking on this forum if you want help with the travel portion

I'm sorry to have to say that if you are applying for the fall 2012, you're late to the game! If you're applying for fall 2013, congratulations for planning so far ahead!

Good luck!