My first question would be, "What does any of the magic you are doing have to do with a Renaissance Fair?" Such a fair is a themed event designed to create a very specific atmosphere; granted, you didn't say anything about your routine or character, but stuff like the Insurance Policy, Confusing Crayons, Coloring Book, and Duct Tape Blindfold don't seem appropriate to me.
Now, if you have actually developed routines for these pieces that make them appropriate for a Renaissance Fair as opposed to simply doing a standard kids show at the event, then accept my apology. If not, then the first thing I would suggest is either coming up with appropriate routines or developing a new act that leverages the Renaissance Fair atmosphere.
David Kaye's column in an issue of Magic magazine from last year featured a Renaissance Fair magician who does exactly the kind of thing I'm talking about. The article showed specifically how he took a "standard" kids' piece -- the "Dubious Domino" -- and developed a routine appropriate for the Renaissance Fair atmosphere. I'll see if I can dig up the issue.
I could suggest lots of tricks...I could simply list every trick on my current and past children's acts...or tell you to browse the kids magic section of a site like Hank Lee's or Morrissey Magic. Coming up with the "tricks" is the easy part.
But it's the routine building that's the real challenge. Rope routines... a silk fountain... color-changing wreaths... Miser's Dream... Victory Cartons... Squared Circle... Strat-O-Sphere... Chinese Sticks... Linking Rings... any of those can work, with some prop modification (painting, etc.) and a solid appropriate routine. I even do Collard in my "medieval wizardy-esque" kids' shows... but it only works because of the distinctive, appropriate routine I've developed for it.
The list of possibilities is as huge, but they're just possibilities. What works for me might not work for you.