You guys are in for quite the experience. I did my BMOQ at St Jean 2 summers ago, and as far as I know, much of the material is the same. Basic training is basic training, although i know that BMOQ was much much more focused on leadership and is a few weeks longer.
I wouldn't fully count on leaving your floor on any weekend, let alone the base, especially during the first 5 weeks. I know people who weren't able to leave for 10 weeks. They can take your leave pass away on the Friday afternoon if they feel like it, and some instructors do. So don't go booking hotels and train tickets and stuff unless you have your signed leave pass in hand, or you can accept the possibility that you might lose your weekend at the last minute and be out that money.
A lot of the first few weeks are more focused on learning the overall routine. You'll get used to things pretty quick, and some may find it very overwhelming. Personally, my first night in the Mega was very nerve racking. The building is effing huge, and you start getting yelled at the second you step through the big green doors. There's yellow lines on the floor that you have to walk along, just like in prison movies. It's definitely a lot to take in, especially if you're totally new to the military experience.
You won't be issued anything until towards the end of week 1 as far as i can remember, so bring a few sets of clothes to wear, both during the first week and for weekends off. They take away your cell phones and electronics for the whole INDOC period, so don't expect to be able to call your girlfriend or whatnot every night. Bring a few calling cards with you because there's payphones on every floor, and you only have occasional access to the Canex during indoc to buy more. Don't bring any snack food, because having it up on your floor is against the rules, and god help you if you get caught. Don't bring any knives (pocket knives are fine, and even useful) or booze either, because they search your stuff when you first get there. Porn mags are off limits too, but there's some newspapers in the Canex that have some naked ladies in em (for desperate times). That's something i wish i knew from the start, because i only noticed it on grad week. You can bring a laptop, and once you get it back after indoc, they don't check any of saved videos you have, so you can use your imagination...
Other than that, just keep your head up and push through. Your instructors, depending on how sadistic they are, will mess with you constantly. Just suck it up and take it with a smile. Some people break down under the stress, so if you notice others falling behind, then help them out. That's one thing the instructors look for - that you can be a team player. Just remember that your platoon is only as strong as its weakest member. Take it easy on those who have a hard time, because they WILL improve. You just have to help them along. The ones who aren't cut out for it will be weeded out as the course goes on.
Most importantly, enjoy the shit out of your course. Sometimes, it's really, REALLY gonna suck. But the shittiest times also usually have the funniest stories. And i guarantee that on graduation day, when you're standing shoulder to shoulder with each other, you're gonna be more proud of yourself than you've ever been before.
Good luck, and have a good course ladies and gents. Hope this helps.