I participated in Magic Music Days in 1996, 1997 (with band, chorus and my dance company so three different experiences) and 1998. My dance company danced at Epcot all three times we danced. In 1996 we were lucky enough to be able to dance on the stage at the American Gardens theater. It was amazing!!! The other two times we danced on the stage in Future World, which is no longer there.
We also sang on that same stage with chorus. As far as band is concerned, we marched before the parade at MK which was really cool. Obviously I didn't know then that I would do the college program twice and have access to the backstage areas during my time on the program.
When we were there with dance, we had the freedom to come and go as we wanted as far as the parks are concerned. The only day that was limited was the day we danced. Most of us were there with our families and we stayed on property so it didn't matter too much. When I was there with school, we stayed off property and had to come and go by bus so the time in the park, although free time, was more restricted.
We also took a dance workshop, I think twice when we danced down there. It was a lot of fun! My dance company has participated in MMD since I left the company, but after we danced there in 1998, we started to save money like crazy so we could fund our trip to Australia to dance by the Sydney Opera House and the 2000 Olympic Games.
As far as MMD goes, I think the amount of time you have on your own is going to depend upon the directors and the chaperones. Have a great trip!