La Mariposa is nice but a little far from the beach. The good news is that there is a bus stop less than a block away, for less than fifty cents(USD) you got a ride to the beach. There are some nice secret beaches down the road from you as well but its a bit of a walk. Pretend you dont understand people on the beach when they say "hey bro" and dont give your money up front for anything especially drugs. Keep an eye on your belongings while at the beach as well, even sandals have a way of ending up on other peoples feet very quickly. Dont Feed the Monkeys.