Stuff to pick in the wild
Datura stramonium(Should be schedule I as far as Im concerned. Super dangerous)
HBWR and/or morning glory seeds (speedy but strippy)
Amanita Mushrooms
Syrian Rue is a good potentiator for above
San Pedro cactus (just realized was legal to grow)
Ephedra (makes a nice tea)
OTC:
Ephedrine(fav legal stim)
DXM
valerian root extract
loperamide
Inhalants: (all work better the faster your heart beat is)
nitrous oxide (my favorite)
albutorol (RX only, but not scheduled and easy to trade for)
nitrites (poppers)
butane/methanol (headaches)
end dust (headaches)
Non-drug related:
Blood chokes (my favorite, press on neck artery until pass out)
blood loss/donate (great but can't do often)
Concussions (synergizes well with above two)
High Altitude
I haven't gotten into the RC scense, so I can't provide much insight there. And there's TONS more stuff to cultivate I havent tried.