I'm from Grand Rapids, Mi and I have been to Silver Lake once so far and am going again this weekend.
I went with just my stock holeshot tires, and did fine... climbed everything with no problem.
I bought some paddles for my last quad last summer, and I bought rims as well. It's a pain in the butt to take the tires on and off of rims... just buy some aluminum rims and some decent paddles, and have them mounted for you.
If you have never been there, just try out the stock tires, they should do just fine, it will at least give you a taste of what you need and you can see what type of paddles everyone else has.