I have one very important piece of advice:
Bring cash, and when you run out, STOP SHOPPING.
This is a ton of fun to go to with girlfriends! Grab a delicious iced coffee outside and then enter the world of trendy/rustic booths that have items you'd only ever see on a Pinterest board. There's something for everybody and little bit of everything from farmhouse inspired chic to hand painted signs and furniture.
There are some mighty fine bargains, but be careful, some booths are definitely better fit for inspiration that you can pick up at Michaels for a quarter of the price. I.e. Mason jars being sold for $8 when you can pick them of for spare change anywhere else.
My favorite part was just spending time with friends exploring. We had a blast, but if you have something specific in mind you want, get there early and wear your walking shoes!