Up until about a year and a half ago, hallucinogens were the only drugs I would do (I'm sober now). And while I wouldn't advise doing a few of these, I don't think it would hurt to just know about them.
Here's a list of the hallucinogens that I've done:
Mushrooms, LSD, 2c-e, 2c-i, 2c-c, 2c-b, 2c-p, and DMT.
There are a ton more out there, like mescaline, ayahuasca, and peyote (which I plan on doing only once if I ever come across them) and others that most haven't even heard of (for good reason).
I'll spare you the description of all of them, seeing as they are mostly similar. If you've done LSD, then you'd have a pretty good idea about what mushrooms would also be like. As for all those 2c's I mentioned, I wouldn't advise you do them seeing as they are classified as "research chemicals."
The craziest trip I've ever had was the second time I smoke DMT. DMT is the chemical in your brain that causes you to dream when you sleep, it's found in every animal and in many different plants. I don't know the process but you can synthesize it out somehow in to a powder form and when you smoke it, it's like living in a dream for about 15-30 minutes.
The second time I smoke it, I was sitting in the middle of Bum Fuck Egypt surrounded by woods with the stars above me. Whenever you smoke it, it hits you at full strength in like 10 seconds flat, so you gotta be prepared. I watched above me as the stars (literally) began spinning around wildly while getting closer to eachother until they were all formed together in the center of the sky. It looked like it was just the sun against a black sky, it was beautiful. Next thing I know, the 'sun' came down and landed about 10 feet in front of me, just hovering there. I start to hear this humming sound that I realized was coming from the 'sun' and it eventual became more clear and louder until I realized it was singing the most beautiful song I'd ever heard. The 'sun' had started out as just a ball of light, but after a few seconds of singing, it started to take form in to what I can only assume was an angel (I'm not religious, so I don't believe in angels; but if I did, I imagine that's what they would look like). So now there is a glowing, singing angel in front of me and I'm just mesmerized. The rest of the world had faded away and it was now just me and her. Every time her voice picked up, there was this sort of neon pulse that emitted from her in a brilliant flash or blue-green light. This kept up until the drug wore off and I was shot back down in to reality, as if nothing had happened. It felt like hours had past, but my watch indicated that it had only been 20 minutes. DMT is the only drug I would really recommend people try at least once in their life (In a SAFE and CONFORTABLE environment, preferably alone in a quiet place. Too many people or too much noise can really throw off your trip.)
If you want any specific info on hallucinogens, just ask and i'll do my best to educate.