I Love rt 66 but you might want to jump off just a bit while in the Flagstaff area and visit Sedon, oak creek canyon and Jerome ghost town. Not a lot of quilt shops but amazing places.
Also the yard sale is not really near rt 66 did that last year with the sisters its an experience all of its own. And not something I would do on a motor bike to many amazing things you couldnt purchase Hahahaha Google WLYS......worlds longest yard sale. When I did it we met a group from Europe that had been doing it for a few years the rent a lg van and every night would pack all thier treasures and mail it home the next day. They said it was like discovering it all over again when they got home and opened them up.