80 pesos (IIRC) one way to the square or to Mega for 1-4 persons. Compared to the expense of the trip as a whole, it's down in the noise.
Blue Angel: Far enough from town to be away from cruise ship crowds but close enough for fairly short cab rides or a 20 minute walk, excellent dive shop on premises, nice pool, on the water (not across the street from it), dock for dive boat pickup, very good restaurant, quiet (only 22 rooms), decent shore diving with free tanks and weights for guests, free coffee in the lobby at 6AM, clean and spacious though a bit rustic rooms, great staff... what's not to like?