If you can, get one of these:

I've never used one, but I know 2 people who have and most of what they have said is positive.

Just make sure you practice before trying the advanced stuff.

A rental wheelchair is going to be kind of the worst, because it's not fitted to you and your needs. But at least you can stand up now and then for a break. Be prepared for the fact you're no longer at eye level with most people around you, and you're probably at boob level for many of the women. Some say this is why the old tradition of having a lap blanket began, but I just made that up. If you're trying to get across the street and idiots are standing around on the curb cut, don't get there and say "Excuse me." Because they're selfish bastards and you'll get run over by a car before they move. Cross full speed, (whether you or someone else is pushing) and about ¾ of the way there, yell "WATCH YER BACK!" so they can jump in self-preservation. The phrase also works in crowds.

Oh, and wear your seatbelt.

Go up ramps backwards to prevent falling onto your head.

Wheelchair ramps rarely have the correct slope. Every day is arm day.

I don’t know what’s wrong with you and sitting, but you can put in the brake for your wheelchair and do dips or something if it helps

Maybe you could rent a mobility scooter instead? Some are suitable for indoors (3 wheels) and the speed is adjustable. It might save the use of your arms and hands, which are not used to the movements you need to make

My suggestions:

Use crutches. If the wheelchair causes even more hurt, it's no good.

Switch between standing (with crutches) and sitting as often as possible, all day long.

Watch your hurt foot: I assume you should not put your weight on it at all.

Watch your other foot: If you give it double work (that would be the natural thing), it is going to hurt soon.

Forget the 25 miles. Or, if you absolutely need to go the 25 miles, you need that wheelchair and someone who pushes you.

Make sure you have your shiv handy so when someone is "helpful" and tries to push you without asking first you can get em right in the kidney

Maybe get an electric wheelchair if you can. If you're not working out regularly, pushing a wheelchair by hand all day could be a challenge, and you'll definitely sore to the bone the next day.

Black Hat.

If you're going through the airport, and you request a wheelchair pusher, ask them if they accept tips.

If they do, tip them a $20. You'll make their day. But don't offer food as a tip. Don't offer foreign money, or $2 bills, or coin dollars. It's not neat. It's not cool. It's either a currency I can't use to pay my rent, or it's a really really low amount of currency that I can't cover rent with.

And if you see one guy doing the work of 7 guys, don't complain that you have to go get your bags. EVERYBODY has to go get your bags, and if one guy is doing everything, it means they're short staffed. If thats the case, squeeky wheel gets the oil is the opposite. Squeeky wheel gets left the longest in hopes that family will take them instead.