Get away from the coast and up into the coffee country! Ruta de las Flores, all the way to Concepción de Ataco for example. Have some fun in Laberinto de Apaneca on the way. Do a coffee tour. Santa Teresa Hot Springs at night. Stay at Campo Bello (run by bitcoiners) and hike up the Santa Ana volcano. Visit an archaeological site with Mayan ruins. Take a few days to explore that side of the country. Ask locals at the conference for more tips. There's plenty to see.

I've seen a lot of bitcoiners expecting the coast to be as developed as the rest of the country and/or that El Salvador is all about beaches. But neither is actually the case.

Enjoy!