Yup. Weed=cheap and schwag. Also true on the coke. The beer is really good, and the whole deal is to just take it easy. Stop in the hole in the wall places, have gallo pinto with lizano sauce for breakfast, and don't worry about much.
As far as specific places, Tamarindo is nice. There's this other place, Playa Manuel Antonio, there are these monkeys that throw things at you from the trees. It's pretty cool. And do some white water rafting if you get a chance too.