Since it was our first time, we opted for one of Princess's cruise excursions - "Masaya and Mombacho Volcanoes, Vistas & Lunch" (SJ1-340), "a rigorous full-day guided photo experience via air-conditioned transportation". The activity level was rated "strenuous".
San Juan Del Sur is a tender port, which lets guests off at a very narrow floating pontoon with steep steps. The message in the Patter was very specific - Due to the size of the pontoon, no assistance is available to our passengers and therefore all passengers going ashore today need to be able to walk unaided (there is no room for wheelchairs and not wide enough for walking frames) along a narrow, moving pontoon and negotiate approximately 8 very steep steps.
They really packed us onto the tender boat tightly. I was in a very uncomfortable position near a window leak, and it kept dripping repeatedly on my shoulder, water torture all the way to the dock.