I'm in Boca Chica but i go to the gym in San Isidro 3 or 4 times a week. There is a Scotia Bank co-located with Bravo and Smart Fit. I always go there because they seem to have the best rate and they're so convenient. There are no Scotia Banks in Boca Chica. Also I get an old fart discount with my bank on ATM fees, capped at 1%.
If memory serves me right, Popular has the worst exchange rate and by a significant margin. Johne would know if there are any Scotia Banks in Juan Dolio, but I suspect there are none. San Pedro would be your next option for that specific bank.
Regardless of how you choose to do this, make sure you have multiple ways to get money. Western Union or World Remit or Remitly are ones I have used. But never be stuck with one way only, because if something can go wrong, it will.