States: Maine: Penobscot
Although you do not have a lot of time, I suggest looking through the MOCA (Maine Old Cemetery Association)listings for their microfilmed records of cemeteries. I just got back from Maine (also visiting from California for the same reason)and I used the list of cemeteries found in this record. The actual listings are available on microfilm at the family history library...but you don't have time to use it prior to your trip. I think these records can be found by searching on Google for MOCA cemetery listings. It isn't complete, but at least it is a start. Or stop at each town office when you are there. They have listings for the localcemeteries.