I remember we went to a weekend rave on a farm once... we arrived in the evening so, we could not realy see where we were...
Turns out the main dancefloor was on a dry dam bed... That was one fooking long trip man... the morning danceing in the sun, I suddenly found myself onthe deck of a pirate ship of old... the people around me all turned into pirates and the dust was the smoke form cannons... it was soooooooooooo real. Also saw many "angels" in the crowd.
I saw clouds form a spiral cone probably 5km acros. I have seen the ocean invert its colours the shiney bits blue and the blue bits shiney... it looked like a blue plasma display... AWESOME. Then there is the spatial fuckup where things close to you look reaaly far. A friend sitting a meter infront of you will look tiny like he is sitting in the distance... (gave myself a blue eye trying to look at my watch becasue of that once).
At the rave i wanted to go buy a cooldrink... made it to the front of the line, placed my order, took out my wallet, put money in my hand, and realised I had no idea how money works, I could not count or anything... luckily a friend saw me and came over to help me pay with the funny coins... That day we locked they keys in the car and had to break a window to get back in... oh and despite being a smoker for just about all of my life, I insisted and believed I didn't smoke... Finaly accepting a cigarette, it felt like the strangest thing in the world... like I have never done it before...
They had some of those porta potties there... while inside I became convinced that we are under attack by space ships firing lazers and stuff at the earth, and then convinced that somehow the energy from all the people danceing repelled the attack. Took a realy long time before I had the guts to open the door.. my wife teases me about that one till today.
Oooh and once I went a little mad for about 24 hours... some hectic acid... was waiting in my bed for the men in white coats to fetch me... Probably took more than a year before I had the guts to do it again...
I call taking acid, bringing the mountain to muhammed.
I would just say that you need to make sure you are emotionaly in a good state before trying it... any problems, depression or fears you may have about life in general will be amplified to the point of unbearableness leading to what is called a bad trip.
Acid WILL change your personality and perception the very first time you take it, and the change will be forever.