I can speak to these since I've gone through the process several times. Depending on the hospital, the activities, dress code, and how volunteers are introduced to the hospital they plan on working in is highly variable.
I can think of 2 different examples that show how different these things can be and how they might influence your overall experience. There was one hospital I started volunteering at in a very upscale, posh area of town. The orientation was relaxed, people and patients were extremely friendly. We were given tours of the hospital. Powerpoints and formalities were brief. Food was exquisite. They provided us uniforms to don, showing off the emblem of the hospital. On top of that, we as volunteers had a an extremely strong support system with the volunteer coordinators and most staff. I can go on and on about this....
A time came when I decided I had to try out other hospitals since there were some closer in proximity to my school. At first I was rejected 🙂thinking🙂, but then I followed up and managed to get an interview, which went horribly. I went to the orientation in a formal outfit, no lunch was served, the shot requirements and hospital policy were byzantine. And on top of that , the coordinator is a snide SOB who can rot in hell because if she thinks I'm about to jump through all these hoops, she's...crazy. She showed me the uniforms that we had to wear during our shift, and that was when I decided that there were other opportunities I could benefit from. Slacks!!?? A tie? Yeah...really pay attention during your orientation. I'm gonna stop here since my blood is starting to boil.
/rant