No need to look for it. You will be approached almost constantly, from as early as leaving the airport terminal, and almost everywhere you go. You will be approached so often it will become annoying. It's hard to tell you what to look for since secent is a big part of it. It's a plant, so the fresher and usually the brighter it is the better. If the buds are sticky to the touch, that's a very good sign. Don't pay more than $10 for a few spliffs or a nice size bud
Linston, mentioned above by the Captain, drove us last reach, and started us out with a few nice buds!