Haven't cooked it yet, supposed to be pretty much the same as last year.
Good power? Yes. They rent generators locally, but have a set of distribution cables and outlets that are reserved just for contests and travel from event to event to ensure they are in good condition.
Access to ice? It's a Sam's Club. Ice, meat, supplies. You could show up at a contest with nothing and buy everything there, including smokers and tents. You may, however, need to be a Sam's Club member. Unlike RD, Sam's doesn't have a day pass system. If you aren't, someone at the contest will be.
Water? It's a single central spigot, which depending on the layout of the store parking lot, could be some distance from your site. Bring buckets, and use the shopping carts.
It is on pavement, so be prepared to anchor down your canopy with weights.