Good grief... so much drama.
The passport photo: any digipic taken against a wall will do. Some people sent candid photos they cut down, one girl even sent a wallet from some Glamour Shots photo shoot. The chief purpose of the photo is so the staff can recognize you and so they can put you into the facebook so your classmates can recognize you.
The "optional fees": I paid for this the first quarter, dumped it after that. The gym is nice, but any local gym is cheaper. You'll get free access to games, but the time you will actually have to GO to games will make it cheaper to pay for tickets as the opportunity arises. The health clinic isn't worth the space in the building... unless it's your only option. I took the money for the fee and bought a good treadmill off of E-Bay, since I always seem to find the time run somewhere around midnight.
Parking: Yep, it really is optional. If you want to use the actual law school parking lot, you have to pay. However, there is a back lot that is free, and you can also park for free in St. Peter's (that's the parking garage with the steeples... crazy Baptists) across the street. The fact that most law students run around with three bags apiece suggests you might want to splurge for the parking sticker.
Health form: THAT really was a pain in the butt. In the end, I wound up having to get vaccinated all over again. Just get it over with. Some of my classmates have told me that they don't actually verify the records, though, so I suppose you can just scribble in a date and let that be that, if you choose.
Advanced lab fee: I really don't have a clue what this is, and as far as I can see I have unlimited access to any and all technology. You'll automatically be charged the mandatory tech fee, and that will get you everything you need: wireless internet, wireless printing, computer lab, Westlaw, Lexis Nexis, etc.
Deadline: rough estimate. If you're a few days late, it's really not a big thing.
Weekend commuting: A TON of students here do this. I live an hour away, so I feel like I'm right on the border of what constitutes practical daily commuting. One of my classmates does a daily commute from Dallas every day, another is a weekend commuter from Houston, and yet another is a quarter commuter from Oklahoma and only goes home on long weekends. I have to admit that there are times when I consider moving to Waco for the week. The cost of renting there is getting to be less than the amount I spend on gas every month, and I could be so much more efficient with my time if I didn't spend 15 hours a week in the car (I do carpool with two other girls, though... phew!). There are definitely advantages however way you choose to do it.
I hope this helps. It's really easy to freak out in the beginning, but just relax. Trust me... you have yet to encounter the things which justify a freak-out! Relax and enjoy the prospect of law school. The reality will set in soon enough.