Some things that I would do in your case.
1. Decide if you really want to spend your summer doing research. Would you rather just do an observership? No, it won't pay anything, but you might get the exposure that you are looking for.
2. If research, then check with your home institution and look for summer programs (HHMI, CHLA Peds Onc, MD Anderson, Roswell Park, etc). There are opportunities to do research with pathologists in most of these programs. Most of these will pay an ok stipend--I got something like $225/wk from CHLA. Some app deadlines have already come and gone I'm sure.
3. After #2, then you have to figure out who you could possibly work with.
4. Base your decision on with whom and what to work on by what interests you. Don't do molecular bio/genetics research for a summer if you hate it or have no basic lab skillz. You'll get a lot more done if you enjoy what you are doing. Find out the possibility of publishing before you agree to anything. While it doesn't hurt to have done the work, you want at least a poster presentation out of your work and of course something in a peer-reviewed journal would be ideal. Contrary to what others may say, you can do a significant amount of work in 8-10 weeks. I had a great PI who essentially had most of the project planned, so I mainly worked out some of the bugs in the assays, did the experiments, collected the data and was able to get a 2nd author paper and a poster at the AACR.
Overall, path research may not give you the bext idea of what pathologists may do on a day to day basis. I would vote for you to set up some type of observership since it seems like that might be the main reason for doing the research (other than financial). Then again, it wouldn't pay the bills either.