Forget the first day; that was dedicated to getting to San Jose (big zero) by plane from Los Angeles via Dallas/Fort Worth.
The next day we traveled by bus to Arenal Volcano – actually to La Fortuna near the volcano. Following is a schematic of the Arenal portion of the trip
Actually we stayed a bit farther down the side of the volcano where we could evacuate quicker if it got active again.
The hodgepodge of pictures we took are here