I'm not sure how you are accessing the port adventure descriptions, but if you follow
this link, you can click on the port location on the left side, and filter down the results by both port and activity level. Click on the "Learn more about this Port Adventure" link on each result, and you'll get tons of info, including wheelchair/scooter accessibility.
For example, here's one listing:
Grand Cayman Island Tour
Location: Grand Cayman, Cayman Islands At a Glance
Activity Type: Family Adventures and Nature Adventures and Sightseeing Adventures
Activity Level: Mild
Duration: 2 to 2.5 hours
Adult Price: $39 (ages 10 and up)
Child Price: $29 (ages 3 to 9)
Ages: All Ages
Discover the sights and sounds of the Caribbean on this two-hour bus excursion through the streets of Georgetown, the capital of Grand Cayman, before arriving at the unique black rock formations known as "Hell." Afterward, visit the world-renowned turtle nursery, the Cayman Turtle Farm, and spend some time with these fascinating creatures.
Additional Information
Be sure to wear comfortable walking shoes on this excursion, which includes extensive walking.
The stops at the rock formations and the Turtle Farm will be approximately 20-30 minutes each.
Transport is via an air-conditioned mini-bus.
Wheelchairs need to be standard size and collapsible; no electric wheelchairs/scooters are permitted. Guests must be able to board and disembark the motor coach on their own.
You should never feel that gratuities are expected, but it is customary to leave a tip in recognition of exceptional service in restaurants, taxis and for excursion guides and drivers. It is always up to you to determine the amount.