Kava kava is pretty sweet.
Also, I remember when my friend bought kava kava from the health food store, he also purchased a bottle of taurin pills. It was a white powder in the clear capsules. He broke a few open and we snorted them. The taurin doesn't give a euphoric effect or anything like speed or other stimulants, but it definitely gives you a lot of energy and keeps you really focused. If you need to stay awake or focus taurins good. But not for enjoyment.