Bringing reptiles into a hospital to visit sick kids seems like a good idea. I know people sometimes bring in dogs and id consider dogs to be dirtier and more of a risk than a snake. Most kids arent deathly afraid of snakes so taking them into the pediatrics unit may be possible....
My local library did a reptile event sorta things where kids could hold them. My stepmom took my little brother and he loved it! It went over very well and even some of the more leery parents were touchy the animals towards the end!