DCL Excursions with a disabled kiddo

[EEs*Mommy]

Guys I have looked and cannot seem to find any info. I will admit I never can get the search to work well but I have been looking for about a week now. So I hope no one gripes about me asking because I am sure it has been asked before I just cannot find it
We are cruising Oct 2012 on the Magic. We are doing a Western Caribbean cruise. So Grand Cayman, Cayman Islands, Costa Maya, Mexico, Cozumel, Mexico. My oldest son has Cerebral Palsy and uses a walker most of the time. He has a wheel chair he uses for long distances (theme parks etc). He can walk some for like transfers etc. He could actually walk the whole time as long as one of us was there to hold his hand but we have 4 other small children (6 4 4 and 3 at the time of cruise) so that is just not really possible. Anyway I am looking for excursions for all of us. I really wanted to do one dolphin and one maybe sting ray or turtle. I know we are going to run into issues which is the main reason we don't travel out of the country anymore.
Anyway now that I have rambled a super long time can you tell me of any excursions that sound like something he could do with us? He is more than happy to do something separate from us but I really wanted to find some things we could do all together. In all honesty at 17 I am thinking he would be perfectly happy to stay on the boat and sleep but not what this vaca is about

 

[Cheshire Figment]

None of the tours are accessible as almost all the locations are outside the US and not subject to ADA rules. As long as the walker or wheelchair is foldable and he can do steps you should be able to get on tours. Also, most places do not have curb cuts and do have steps to get into and out of shops.