Your history of tutoring and TA'ing will explain your interest in the YMCA, so it would be easy to say you shifted to the Y after those experiences. As for the VA, local hospital, and Cradles to Crayons, you'll have to be able to explain how each of these appealed to you and what you were hoping to get out of the experience, which doesn't sound too hard to do since you do have an interest. It'll look best if you stick with these for the duration until your application next year.
The big question to ask is would you really do all these things if you weren't applying? If you would, then go for it. If you're only doing it to pad your app, pick one or two and make waves at those places, something awesome to show the adcoms this is your heart's interest.