I plan on getting hammered on the house at the WLU dinner, assuming it's not dry. If it is dry, W&L immediately moves to the bottom of my list.
I'd go to as many admitted students days as you can reasonably fit into your schedule. I've seen advice to visit each school you're visiting twice - once on a visiting students day, once on a normal day to see what it's like when they're not trying to sell it to you. I think this is a bit much, but I plan on visiting any school I'd consider going to and see if I like it. Why not (other than obvious vacation/travel/financial considerations)? Just don't sign anything - especially if they have an open bar