OP: Like neednsnow said a few pages back - just go about it as a normal everyday life interaction and invite. Had you posted something like, "Going to be in the area, does anyone want to meet up?" it would have been so less creepy.
Problem is, he wasn't just looking for people to ride with, he was looking for "bunnies" to party in the hot tub with. There's not much that's going to make that less creepy.