The Daytona Beach Police Department (DBPD) is the primary law enforcement agency for Daytona Beach, Florida. There are 241 sworn full-time police officers, 105 sworn part-time officers and 81 civilians on the force which is headed by Craig Capri who serves as the Chief.
According to Amtrak's website (select stations, then midwest) there are 40 Long-term Parking Spaces at Kirkwood. I don't have any experience with KWD, but I've left my car at various stations in IL and IA for a month at a time with no problem.
That said ....he should go to South Station, especially for Thanksgiving. People line up for the train 20-30 minutes before the train arrives on the day before tg to get choice seats. South Station is the originating point of the train, so all seats are empty. Back Bay is the 2nd stop and he'll be filling in there. This is especially important if he is travelling with a classmate and they'd like to sit together. Amtrak throws around the term reserved seats or something like that ...