The snow cover makes Route 66 very photogenic. A mile east of Parks you can stop and see the old portions of the road that were bypassed when Route 66 was realigned. There are several places to stop along the way, but one is missing.
The historic rest stop on the south side (left if you are traveling from Flagstaff) has been closed. You can still get in there, but the toilet facilities are gone. So are the tables, in fact.
You do not have to hold it until Williams, though. The Parks General Store is open daily in Parks along with the gas station.
Across Route 66 from the snow play area is the trail to Keyhole Sink. It is still open, but the trail, of course, has patches of snow and mud where it has melted. The Keyhole Sink trail is about a mile long to the Keyhole Sink.