Personally, I like little gaps, because it's nice to have a break here and there, especially when the class you just attended was very boring. At the same time, soemtimes you just want all your classes to be done with, so you'd rather have everything without any gaps.
In terms of EOW, they'll tell you.. I'm not sure how, hopefully someone will check this thread and answer this question.
I found that spreading out similiar courses didnt really matter for me; something like Bio for example, I would personally like the tutorial to be on the same day as a core, so that I can ask questions from the lecture I had that day.
How you organize your schedule is such a personal thing. I'm not a morning person and therefore I struggled to even go to my 8:30 classes. Also while at Mac for first year, I developed a habit that I still have today -- staying up REALLY late. Like abnormally late, like 4 am everyday. But at the same time, if a class really doesn't engage you, no matter what time it's at, you just won't want to go. I had Health Studies 1A03 at 12:30 twice a week and I barely EVER went, just because the course was so incredibly dull to me! Also, being fresh out of high school, your body will still be adjusting to not having 6 hours of class from 9am to 3pm everyday like you've been having since Grade 1. Believe it or not, this year, you will discover that a 10 minute power nap at Mills is quite good sometimes