Having had an ankle injury that required a cast and then an air-cast, get the wheelchair/scooter!! Trust me, you'll thank everyone who suggested that later.

edit: See if you can get a wheelchair with the extension legs (eg the ones that have support under the knee & lift). If you have one of those you'll be able to prop up the ankle, which will thank you later. You can also tuck a pillow in the chair & put that under the ankle to put even less stress & strain on it.