If you want something really nice, you've got to try Coco Loco. With a brilliant range of hot/ice chocolate drinks (I seem to recall about 25 that were vegan!), not to mention some delicious vegan food on offer, you'd be crazy to miss it. The atmosphere is brilliant, be sure to check out the ceiling while you're there! There's lots of great history available for your perusal while you await your goodies, and the music is always just right. Old jazz FTW!
The food is probably a little rich to go every week (if you're type 1, bring extra insulin!), but you really ought to try it. You'll love it.