Hi Matt,
This is "Cudachaser" (Joe). I use hand crutches since I have neuropathy in my lower legs. I have no problem access any of my favorite dive sites using my crutches wearing a 30 pound scuba tank on my back along with 16 pounds of lead ballast. I even manage to to do beach dive quite easily. I joke with my dive buddies about the close up free parking and that trudging through the sand is easier with 4 legs (crutches + legs).On a more serious note, I find crutching on soft sand not that difficult and hard sand, a piece of cake. When the seas get rough on a boat the crutches give me more stability then many of the abled bodied on board. You just have to be careful where you put your crutches when you sit down...I lost one over the side once and had to survive the remainder of the weekend on one crutc...that was a bear!
Have a great honeymoon...Sanibel is really beautiful...It noted for all the shells that wash up
PS...I would just leave the leg in the hotel room and crutch it at the beach
Joe