oh how exciting! I live 2 hours from there and it is such a wonderful place :)
be prepared... they don't have buggies, you have to get a paper slip when you walk in at the customer service counter. You grab a few bolts, go get them cut and put the cuts in a hand held basket. Once the basket gets full - check out, take it to the car - go for lunch and then come back :)
it is an amazing place!
have fun