We spent an afternoon here when we were there last year: https://www.instagram.com/explore/locations/1290768067697065/glass-factory-cabo-san-lucas/

My wife enjoyed it. I thought it was ok.

Take a boat out past the point of the bay and watch some whales.

Go visit a pharmacy and get a year's supply of Z-packs

Rent a car and go down to Todos Santos

Go hike Mt. Solmar (overlooks the arch and lover's beach)

Fishing is really good if you're into that. It can get pricey to charter your own boat, but you can probably find options to go with a group.

Walk down to lovers beach/divorce beach and sit in the sun