I thought I remembered you having shoulder problems, but wasn't sure, so I thought I'd suggest it, just in case. If you do try it, be very careful of your shoulders; we don't want you being in unnecessary pain on holiday!
I would say the best way of stopping people walking in front of you, is just to be as visible as possible (though you don't have to go as far as high-vis jackets
). Also, make sure your feet are very visible (bright shoes would be good) as I think a lot of people don't realise quite how far out our feet stick, sometimes.
If you're walking or pushing at any point, you could have husband play 'trail blazer' but be aware that sometimes people will cut between you (I had people do this to me last trip, even though I was right behind my mother and obviously talking to her
).
Oh yes, something else I meant to say: crowd avoidance is better than crowd dodging! If you know there will be a large crowd somewhere, try not to get into the middle of it. For instance, if you've just watched a parade, stay where you are for a few minutes to let everyone clear, before you try to move. Also, after evening entertainment, don't leave with everyone else in the huge rush. Instead, hang back for ten or fifteen minutes, then wander back to the buses via the shops. They stay open until the park closes its gates, but they can be fairly empty at that time, as everyone is just trying to get home. If you reach the buses about half an hour after the entertainment finishes, you'll normally find them to be fairly quiet (a lot more fun than being stuck in a heaving bus with people leaning over your wheelchair / kicking you / practically sitting on you etc.).
EDIT: Love the photos Bill!!