Anyway, I have experimented with many different sorts of drugs. I don't have an addictive personality, so I don't worry about it.
I drink alcohol and coffee, and probably more than most, but not to any degree of regularity, in that I might drink a lot for 3-4 months, and then drink nothing for anywhere between 1 and 6 months. With coffee, it's similar, I drink a lot over a few days, or even months, but then not drink any for days, weeks, or months.
Anyway, I think all conventional drugs are worth a shot, assuming you are healthy, and have a safe, preferably legal, supplier; many countries have strict nanny-state enforcement, and this isn't always an option, because, you know, those same countries are often the ones that allow accumulation of deadly weapons and ammunition, but getting high... out of the question!
In my opinion, the only ones I didn't find particularly good were opiates, very overrated in my opinion; I think the coolest part about them is listening to stuff, even minor sound effects become pleasurable, but you can get more cool audio experiences with weed.
For creativity, anything in moderation improves this, including caffeine and alcohol. Although having anything in excess goes in the opposite direction. Most conventional drugs in small doses have a positive effect on creativity and productivity.