wear a sling bag over your shoulder that hangs in front and snaps or zips closed,
or a big tote that closes, but put your credit card and money in your pants pocket. it's safer and easier to get to. be sure to return it right away.
wear comfortable shoes.
if you wear a backpack you have to keep taking it off whenever you need something. if there's a coat check, use it. it's worth the extra $. wear layers. it starts out cold, but all those hot women heat up the place in no time.
do a sweep of the place and then go back to what interested you.
the food usually is terrible and way overpriced. bring a sandwich and water. or just buy bad coffee or a soft drink.
use the bathroom early in the day and notice where the out-of-the-way ones are. you'll be happier.
last but not least, have the best time ever!