It is not walkable. You can take your own car to the visitors centre or take the purple bus. One more option is to walk to IMAX theatre nearby and take the pink jeep tour.
It's 7 miles to the rim. Use the Purple shuttle to the Visitor center. Only drawback is the first run is at 8 so if you want to hike early you'll need to drive in.
Definitely not a walking distance. But the hotel sometimes has shuttle so check with them
A couple of miles....
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