I did a TNT ride in '99 one of the best experiences I've ever had! The coaching was top knotch and the transportation to the event was, also the rooms in Vegas, the banquet the staff support all along the way you couldn't has for a better organization!
That said I also do volunteer work every year for the LiveStrong Ride here in Portland and what a great group of people to work with!! I love it and will do it every year, this next spring '09 I plan to ride it as well as work with the pre ride stuff, wouldn't miss it!
I also do the Komen for the Cure Walk in Portland every year and it's fun, but I only do the walk I don't actually or extensively raise funds most all of my friends are doing the walk too, we're spread so thin.....
Those are the only ones I've been involved with but I gather to say that any organization that works that hard to raise funds is well worth it. You might just want to see what the ratio of funds raised actually go toward the cure of said desease. It's always better for the monies raised to actually go toward the cure. You can always research them and see if their mission statement is in line with what you want and feel compelled to work for.
SadieKate is right about whom is doing what and for whom, follow your heart helping others in need is always a good thing to do. Have fun with whatever you decide and good luck!
Life is like a 10 speed bike, we all have gears we never use.
Charles Schultz
"The bicycle is just as good company as most husbands and, when it gets old and shabby, a woman can dispose of it and get a new one without shocking the entire community." — Ann Strong, Minneapolis Tribune, 1895