I've only done one big festival (or rather, have only been to the same festival numerous times) which is Earthcore in Melbourne, Victoria, Australia. That's always good fun, but it's more to do with the company I keep when I head there, since I catch up with my friend that got me in to psy when I go.
That being said, the festival itself is pretty bloody awesome. The first one I went to had J00F, Michele Adamson, Protoculture, Raja Ram, plus a whole host of others I can't remember (it was 2 years ago). 3 day party out in the middle of nowhere. Stinking hot, but the chai tent was brewing some great stuff, and there was a truck going round spraying water on people for the fun of it. Definitely a cracker of an event with a great vibe.
There's a regular club night I go to here in Sydney called Evolve which isn't bad. Problem is it can be rather empty some nights, especially over the winter. At least it gives me my psy fix quite regularly.
If you're in Vancouver (yes I know this is the TOTA bit, but I may as well mention it), there was a regular (ie every Friday) night called Organix in some tiny club, although I can't for the life of me remember where the hell it was. I remember it was rather on the edge of the dodgy part of town. However, that being said, both times I went there, it was a great atmosphere inside.
I guess in the end, what makes a party is the vibe. The music is just a bonus.
I would rather have the truth tear my body apart...
Than have my soul wander forever in darkness...