When returning to your hotel always try to catch the taxi on the water side of Raphael Melgar, it is usally cheaper. and definitely avoid the taxi lineup by Punta Langosta.divingjd:<-- snip -->
Coming back from town, the same rule doesn't apply, but just remember what you paid to get into town and insist on paying the same, or maybe just a few pesos more, to get back to the hotel.
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Learn the very helpful phrase "Cuanto questa para <your hotel name>" and use it before you get in the cab