Do

Ziplines, rappels, a natural-pool swim, and a waterfall on the edge of the rainforest. The Monday adventure option. Confirm it runs for a party of six.

Self-guided: La Coca Falls, Yokahú Tower, La Mina. No reservation needed, first-come, arrive by 8 AM. Check conditions the day before.

The clifftop fortress and UNESCO site, Wednesday's anchor. About $10 per adult, kids free; the ticket also covers Castillo San Cristóbal.

The "window cave" over the Arecibo valley. Guided, about 1.5 hours, roughly $29 per person. Books up, so reserve about two weeks ahead. A flex-Friday option.

A near-enclosed crescent cove, one of the prettiest beaches on the coast. 20 to 25 minutes west.

The closest swimming beach, 10 to 15 minutes away, and a known shore dive site.