I wouldn't mind a 30s setting as long as it doesn't take itself too seriously... Jungle Cruise and JAWS for example. Of course, the actual dark ride/360 part of the attraction shouldn't be played for laughs, but the beginning outdoor portion could be a little light-hearted. If it's going to be all-ages, a few cheesy jokes/quips at the beginning wouldn't hurt. Of course, the ride will be a great addition, regardless