There are better roads in the area for fun tho 6 is okay for scenery. Take a break at
http://en.wikipedia.org/wiki/Kinzua_Bridge
Only a 1/2 hour break and very cool.
If you can spare a 1/2 day or less detour....when you get to Coudersport cut off 6 and head down 144/44 which is a legendary ride, maybe take a break at Yesterday's in Renovo - head south of Renovo and turn right on 144 and have a total ball. Just superb riding after the first 12 km or so which is rough but still much fun.....kid was whooping in my ear the whole way. ( we have Scala's )
Catch Wykoff Run ( you'll have to be careful and not miss the turn ) then back north to 120 and you have several ways to get back to 6.
Just be careful with deer after 6 pm and in the early morning.
This is Wykoff the opposite direction you would be going.
[video=youtube;j_A0yVbfXG0]http://www.youtube.com/watch?v=j_A0yVbfXG0[/video]
Where this starts is your end point on 120 and there is food there.
Careful with fuel in the area especially end of day or Sunday and don't expect cell coverage.
If you are starting at PA - then you can be there by noon or sooner, Millstream Inn is reasonable, Pauls Motel is cheap - get the front rooms for $55 with wifi and fuel just outside.
Breakfast at Fezz's diner which is right on 6 - meals are huge.
Can't help you much further in the US tho do the Cabot Trail from the east side in my opinion then hit Sydney for the ferry.
If you do any of the Evangeline Trail then hit the GastroPub in Wolfeville...
http://www.novascotia.com/en/home/ourregions/scenic_travelways/evangeline_trail/default.aspx
You can swing across then to Peggy's Cove in an hour and meander north along the coast.
We did the Ferry to PEI and then off via the bridge.....it's only a half day at most as you head to Cape Breton. Bridge is very cool - nice stop at the end of it with good photo ops.
When you are going you must book accommodation on Cape Breton ahead of time after July 1 - it's sparse and filled up. Mind your fuel as well and weather can be totally insane.
You might get something at Meat Cove at the top of the island ( maybe take a whale watching boat run - say hi to the Capt Fraser of the Oshan. )
http://www.oshan.ca
Looking forward to a Gaspe report - heard it's superb.
The South Shore of the St. Lawrence is okay and Old Quebec City for sure.
But if you can swing north of Montreal and there is some good riding there. Someone just posted up a Mount Tremblant loop and if you are really in the mood take the Northern Transcanada over to Rouyn-Noranda then 101 down towards North Bay.
The ride from Quebec City to Toronto is mind numbing and Montreal traffic horrific. Best avoided.