All kids are different. My daughter was Miss Brave for a bit and went on all the big rides and loved them (so she says) but now won't ride any but splash. I say explain how the ride is and what to expect and let him decide if he wants to.
I got stuck on splash halfway up the drop for about 5 minutes then the ride started moving but then got stuck again at the top for about 5 minutes. It felt like we would fall backwards. No walk off. It was late and not crowded so they let us ride again with no problems.
Say your pass expired feb 1. If you renew tomorrow w/o a down payment your pass will expire feb 1 2014. If you pay a down payment it will expire the first day you use your pass. I've only renewed passes in park though not online. Like others said I believe you have 30 days to renew but w/o a down payment your renewal date is your expiration date. Hope this makes sense.
Mines the same. He really enjoyed the food & drinks at Trader Sams before heading into the parks. We just recently went for my daughters bday on a Wednesday and it was much less crowded and he had a great time.