The dumbest thing we did was killing ourselves to get to a restaurant, then not enjoying the experience.
We visited WDW in 2004- me, DH, DD (6 at the time), and DGrammy. We did the MK during the day, then had an 8:40 pm PS for Biergarten in Epcot. We had really enjoyed the Biergarten in the past, mainly for the fun atmosphere with the entertainers.
We decided we had to leave the MK before the fireworks

to get to Epcot in time. We hit the monorail, and made it to Epcot about 20 mins before our PS. We booked it to the very back of Epcot (I am Pooh sized, and I was huffing and puffing pretty bad by the time we got to Germany

) and got to the Biergarten right on time. The band was just finishing their show, so we sat down and got situated. We got our food, and ate while we waited for the band to start again (the main reason we made the PS there in the first place). Eventually, we asked the waitress when the band was starting again. She then informed us that we had missed the LAST SHOW OF THE NIGHT!!!
We missed the fireworks, went through all that hassle, and practically ran through the park, just to find out that the German entertainment was not going on

!! Oh, well, now we know that if you want to see the band, you need to be there BEFORE 8:40 pm.