I was a corpsman from '75-'79. Boot camp generally sucks, but if you're in decent shape, it's a breeze (I wasn't, it wasn't).
Corps School (Great Lakes) was one of the best times of my life. The class was basically 50/50 male/female ... mostly party people.
First duty station was Camp LeJeune, but at the Naval Hospital, not with the grunts (until later when I moved to Dispensary Services and filled in for vacationing Corpsmen). I loved it. I went to the range enough to qualify expert with .38, .45, and rifle (M16 was nearly brand new issue). Corpsmen with shooting ribbons get an extra beer from the Marines. 😀 "FMF Corpsmen" go through 8404 school (Field Med School). You learn battlefield medicine, dragging people around by the collar, gunbelt, whatever and general "how to do grunt stuff." You do gain the option of wearing the Navy version of the Marine Uniforms (even the dress blues, but with Navy insignias).
I transferred up to NRMC (Naval Regional Med Center, Portsmouth VA - near Norfolk) and did my last two years in a Research Lab and got certified as an Electronmicroscopy Technician (also did photomicroscopy).
Keep in mind that there's Corpsman jobs for anything you'd see in a hospital or clinic... and then some. That includes 'Vertical Transport Operator" (the evevator guy ...) Security, Lab, Ward Medicine / Nursing, CCU, ICU, Pharmacy (tech), ER, ambulance, Aviation (flight certified is a tough area to get into ... Patient transport via Helo and big Air Ambulance, Psych, OR tech, supply, medical records, pretty much anything, any job within a medical environment. In the field, you can be with the SeaBees (construction), with the Grunts, in a Sub, EOD, SEALs, ship, boat, " Anywhere in the Fresh Air."
"All-in-all, I had a ball!" I also did two 13 weeks stints (TAD / Temporary Assignment of Duty) with Explosive Ordnance Disposal (EOD Group Two) from Fort Story VA. Crazy people don't crazy things with stuff that blows up (in this case, sweeping the Inter-coastal waterway for unexploded artillery rounds at Cp. Lejeune).
The military also has facilities for recreation. While at Cp. LeJeune, I started learning to fly at the base flying club. A Cessna 150 went for $11.00 / hour (wet) and the Flight Instructor was another $8.00. There ain't anywhere in these here U-nited States where you can/could get any plane (and Instructor) for under $20. At the time, civilian Clubs were getting $35-40 and hour for the plane and `$12-15 for the CFI.
There's other perks: real job experience (employers even count it as real), advanced job skills, college cash, VA loans, probably some travel, and some of the tightest friendships you'll ever have. Not too mention snappy uniforms and, as a corpsman, you have access to all the Procaine Penicillan (but being the Doc, you get to take the pills......) you can use...
You don't (didn't have to) do the full seven on active duty. When I was in it was a six year hitch, with four years active, two years inactive (active reserves are/were an option).
Good Luck
Scott