This is something I've really always wanted to try too, but I live to far away for it to happen anytime soon (I live in toronto and my folks live all the way back in Newfoundland, Canada). I think it'd be cool though, because my parents are the "cool" sort. They were in a rock band in their younger days, partying, drinking, drugs, sex and rock n' roll and all that good stuff, but once I was born they quit the band, sobered up and became more responsible but still cool at the same time. They let me drink a little while I was underage to make sure I wouldn't freak out once I started to go out partying when I was a teenager. They taught me to use moderation with substances and I've been around tons of different drugs around them and it's no bid deal as long as I'm not doing anything too out-of-whack. Even though they don't do drugs anymore I think it would be a great bonding experience considering their background and the fact that I'm also a musician and we'd be able to just roll and talk about music and stuff for hours.
I do have to add (as I've seen some other people post) I think I'd be a little uncomfortable if they started to get all "loved up" with each other while I was there...it's cool and all but I wouldn't want to sit there and watch my parents act like that...it would just be way too creepy lol!