There were two clubs at my HS that hazed. Unfortunately, you were a de facto member as a student. For men, it was the Men's Club for the ladies, they had Pep Club (I went to a Catholic HS as well).
There was a hell week for each group. The Pep Clubbers had to come to school with their faces painted like dalmations, wear 6 pony tails, white t-shirts, I think some kind of skirt, and something with their shoes and socks that I have forgotten now. On Friday of that week, they were required to get the signatures of 20 seniors on those white t-shirts. The Seniors could request anything for those signatures (mostly just running up and down halls yelling how great the senior was). At the end of the day there was an assembly which was basically where a select few of these freshmen women participated in things like pie eating (or maybe it was jello eating contests).
Funny thing was -- that was the only thing that the Pep Club really did all year
Men's Club was similar. There was a similar hell week and we had the t-shirt thing as well. Men's club was suspended for one year when the Seniors took a bunch of freshmen out to a place where everyone went to drink/get high. The freshmen boys ended up getting liquored up and the seniors had them running in a big naked circle among other things that night. No one got in serious trouble over it though (yes, hazing is illegal in our state).
There were also a number of standing traditions. For example, the school seal which resided at the cross between the halls which housed the junior and senior class lockers was sacred. If anyone but a senior stepped on the seal, they had to kiss it -- this was passed on by students and administration alike.
To my knowledge, very few students declined to participate in these activities. I was the only one that I can remember in my class that declined to participate in the men's club initiation activites (I just waited and joined it my sophomore year, sans hazing
).