I went to the Renaissance Festival with my two boys, and my brother on Saturday. Including tickets, for myself and two children (yes, I was silly and bought a ticket for the 4 year old, and then gave it away once we got there and I realized that we didn't need it) I spent $89 -- and was there from 11 to 5:30. I think it was money well spent - even if the Mall of America Nickelodeon Universe coupons don't end up being worth more than a ride a piece (we were handed five of them as we walked out, but they expire at the end of the month).
First stop was the enchanted forest - where they both managed to get very dirty. The boys are thrilled with their new wooden swords, but even more so, because several adults at the Festival sparred with them. They also liked the Royal Navy Adventure (so much that they asked to go back for the 4:30 session), and watching the skit of Little John throwing Robin Hood into the river. Mas was pretty impressed with one of the street jugglers - and I've watched him before, but never manage to stay to the end and throw money at him. They were pretty pooped by the time we watched the knife throwers though.
Food-wise, the boys liked their chocolate covered frozen bananas, and later devoured corn dogs. I had a bread bowl of beef stew, and a beef gyro (the filling was good, but the wrap was stale).
And no, I didn't dress up. Unless you count a white sailing hat with blue trim (Coolibar), long sleeve turquoise button down, blue-jean skort, and lace up cowboy boots "dress up". (For some reason the people at work asked me about my attire?)