Family of 4 Activities in Port

I'm curious about what our family of four, including two kids (6) and (4) may find worth doing while in port in Cabo and Mazatlán. We live on Cape Cod so whale watching is something we'll pass on. But, is there anything within walking distance of the ship/pier that we may find enjoyable and that is safe?

Mazatlan, nearby rustic Stone Island Beach (sandy beach play, affordable horses), or $8 taxi to El Cid resort (pool and beach play, cruisers are always welcome, pay as you go)

Cabo, large boat tour, or small panga boat tour/water taxi to lovers beach and/or medano beach. Get tender ticket early or WAIT HOURS TO GET OFF