I think your agenda is way to ambitious for the amount of time you have.
If by La Paz you mean the waterfalls they are northeast of San Jose. Volcano Arenal is northwest of San Jose. I would pass on going to Playa Herradura as that is southwest of San Jose. You are trying to go in 3 different directions in just a few days.
For your first trip I would stick close to the gulch and take a few day trips to different attractions close by that interest you and devote your nights to trolling for pink snapper.
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Pura Vida

Only Irish coffee provides in a single glass all four
essential food groups:
alcohol, caffeine, sugar and fat.
Alex Levine
