MarineCorpsBootCampSurvival.com

Hell on earth comes to mind, at least for most of it.
Phase one consists of a lot of classes on Marine corps history and traditions, uniforms, grooming standards, and drill. Boring as hell, but you had better know that stuff. Physical activities include drill practice, the obstacle course, bayonet assault course, pugil sticks, MCMAP (Marine Corps Martial Arts Program) strength and endurance course (sucks ass. basically a platoon run mixed with push-ups, pull-ups, etc.)
Phase two is rifle training. The rifle training is 2 weeks of classes on shooting techniques and basic marksmanship and dry firing, 1 week of live fire practice, a few days of rifle test practice and then the rifle test. Along with that, you will be getting a lot of field training, such as: setting up tents, hiking, the gas chamber, camouflage, fireteam tactics and movement, and, of course, the crucible (and reaper, if you go west coast)
Phase 3 is a breeze compared to the last 2. A few more classes, final swim qualification, lots of study for the practical application test and written test, uniform adjustment, final drill, final pft, graduation practice, and a visitation day, then graduation.

The big challenge from recruit training is the psychological: fear, stress, lack of sleep, more fear… You can’t really prepare yourself for that. For much better info on actual training events, go to marines.com
If you know where will go for boot camp, you can go to that website and get a training matrix. I went to MCRD San Diego and got a training matrix from http://www.mcrdsd.usmc.mil/ and forgot I had it until about week 3. It was very handy to know what was coming up. Also, that same website posts updates on the graduating platoons, including photos, so loved ones can follow your training. Hope this helps, Semper Fi