Below is a partial description from the Army's website.
Military Police protect lives and property on Army installations by enforcing military laws and regulations, as well as controlling traffic, preventing crime, and responding to emergencies. Military Police are responsible for providing support to the battlefield by conducting Area Security, Internment/Resettlement, Maneuver and Mobility Support, Law & Order, and Police Intelligence Operations. Some of your duties as a member of the Military Police Corps Regiment may include:
Law enforcement patrolling by car, boat, bicycle, and on foot
Interviewing witnesses, victims and suspects in the course of investigating crimes
Crime scene security and processing
Evidence and fingerprint collection
Arresting and charging criminal suspects
Military Police working dog handler
Testifying in court
Enforcing traffic regulations and guarding entrances to military facilities
What you do on a daily basis and whether or not you consider it a "ggod job" can vary greatly depending on several factors such as where you are stationed, what specific assignment(s) you are tasked with, who your supervisor is, and whether or not you enjoy the job and whether or not you are good at it, etc. I know military police that really like what they do, and I know military police that wish they were doing something else.
Good luck! Keep us posted!