Make sure you drink LOTS of water. You are on top of a dirt mound and it really sucks the moisture out of you....
They give you a bag to put crystals in, but I bring a 5 gallon bucket. Also throw in some digging tools. I bring a small folding shovel, a brick hammer, a few picks, garden trowels, etc....enough to thrown in the bucket and then carry around. You can park your car right at the mound, so bring a picnic lunch and snacks. Some days you do well...others....no so well
You will see people there with carts lugging out huge rocks for landscaping too. It is one of those good family fun things you need to do.
We liked Lake Catherine because we got to go up and do crystals and visit Hot Springs. Be sure to go to the Gator Farm while the girls are doing the whole spa thing.