Nanoer, the bracelets only come in a lime green color. You also can get them by successfully completing the quests (actually any one of the quests). They will only give you one bracelet per person, so if you are planning on doing the quests they will not give you another for redeeming the coupon. I think of this as sort of a 'non-prize' because I figure VMK players going to a park are going to do the quests and get the bracelet anyway. I think of the hidden Mickey tour coupon in much the same way, figuring that VMK players are going to complete all 4 quests in order to get our cards and get on the tour (so we can get more cards). So, it is also a non-prize.. it's advantage is that you can turn it in immediately when you get to the park and get signed up for the tour before turning in all your quests.
Have fun at the parks!