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.
The vast majority of the 22,000 or so miles over which Amtrak operates are actually owned by freight railroads. By law, freight railroads must grant Amtrak access to their track upon request. In return, Amtrak pays fees to freight railroads to cover the incremental costs of Amtrak's use of freight railroad tracks.