My son is currently at MMI, but he is a Falcon Scholar. I will try to give you a run down....
They have a short "ROC cycle"when they arrive in August. This is kinda like a "plebe" experience except not quite as long or intense. It mostly involves learning the basic military skills - marching in formation, setting up their rooms, some memorization (I think they have a cadet manual they must read and memorize parts of), they get "smoked" which means pushups, flutterkicks, etc.
During the school year their academics mirror what they will take the first year at the academy - Calculus or Pre-Calc, Chemistry, English, History, ROTC, Physics (Coasties only), SAP fitness (This includes aquatics once a week). My son really likes all his professors and says they will do anything to help you if you need assistance. He really feels much better prepared because of this year.
They have weekends where they can leave if they have good grades, military performance, etc. They often go to Tuscaloosa to eat dinner on a weekend. My son would say the Coasties do this more since they are "rich", most of the kids don't make money like the Coasties do.
The school days are fairly regimented with formations during the day, and PMCQ (nighttime study period each evening). There are extracurricular activites available also, band, honor guard, white nights (precision drill team), etc. Some of the SAPs get involved with these as well. My son is in the honor guard and will be going to New Orleans to march in a Mardi Gras parade.
Please PM or just ask if you have any questions - I can ask my son to get you specific Coast Guard info. Overall, he has had a great experience this year so far.