I've done DMT, LSD, MDMA, 'shrooms, Salvia (actually really strong, you just need to chase it with NO2), GBH, Xanax, and the good old-fashioned classic hallucinagen, weed. Crystal meth is technically a stimulant, but the lack of sleep for twelve days had me hallucinating like mad. Benzadrine is a downer, but it made me trip like crazy.
I can't really recommend any of these, as I've seen too many lives destroyed by them. Smarter is the route suggested by Katiebee. When life doesn't suck, why would you want to escape reality? When life does suck, drugs won't help at all.
Use what works for you, but personally, I'm over it. Most of my friends smoke weed, I don't look down on it at all, and mushrooms and other drugs on an infrequent basis can work just fine for some, but I'm clean and sober for four years and change, and that is working better for me.
For god's sake, whatever you do, be safe! I've buried five friends, this shit is for real, and it will kill you VERY quickly.