I'd have to go with fishing too ... easy to relax by logging in @ the fishing guild and catching a few hundred shark with my arm

had 98 fishing when that came out so everyone seemed amazed. Also liked selling the shark and buying another piece to the dragon armour/weapons collection.
People tell me I'm so patient it's unbelievable, but there's other things to do while playing RS right? Usually I'd just do homework, chat, play Xbox, read, practice piano, and make lunch/dinner all while fishing. It's what gave me the patience (and tactics) to continue with woodcutting .. although that's wearing away since I don't play RS as much anymore.
Also had a 99 fishing party a while back and had a crappy time filming it since I completely skipped over the moment of achieving 99. Oh well .. the drops were around 2m total, mostly dragon items, talked to a few friends afterwords, it was alright.
I swear the pointless ranting & arguments I see at the trees next to Seer's World 100 barely showed up while in the fishing guild a few years ago. Now it's not even funny, it's just stupid drama .. perhaps I just ignored it back then. Anyway, I made friends both woodcutting and fishing, but I'd have to say I know the fishing bunch a little better overall. We only talk occasionally nowadays but .. they were good times.