I am considering doing the same, 3 day trip from Mallorytown. My initial route planning looks like this:
http://maps.google.ca/maps?saddr=Mallorytown,+ON&daddr=Boonville,+NY,+United+States+to:43.47362,-74.25859+to:Saratoga+Springs,+NY,+United+States+to:43.59716,-71.68617+to:Conway,+NH,+United+States+to:44.05368,-71.64907+to:43.8987853,-72.0455183+to:43.8380481,-72.345192+to:43.92694,-72.92849+to:44.00513,-73.15955+to:New+York+8+S+to:Tupper+Lake,+NY,+United+States+to:44.32267,-75.46621+to:Mallorytown,+ON&hl=en&ll=43.755225,-73.278809&spn=3.483611,7.13562&sll=44.364115,-75.17807&sspn=0.862003,1.783905&geocode=FWOzpgIdyRZ6-ymB8BZHsxTNTDFTOjeX0npyyw%3BFSCClwIdj3SC-ynNMgWqLN7YiTEkWM_5OBUd9Q%3BFdRalwIdYueS-ykB0H_49QjfiTEAOmwEnFDikg%3BFXplkQIdCyOa-yk51FvHTjjeiTGoopQbakUdZA%3BFWg9mQId5ie6-ylzH_qiEk6zTDG9qHBCccWSSw%3BFa8RnwIdJMrC-ykl0cD10QmzTDEWsZhbkJ0WGw%3BFbA0oAId0ri6-ymdJnXbxYG0TDH4yBvUsNQt3g%3BFaHXnQIdMqy0-ynt5m3_fpa0TDGSdJjGYHPxbg%3BFWDqnAIdmBmw-ynn3jvke8S0TDF3PMuH_iMvaQ%3BFZxFngIdFjOn-yktPWY80Ti1TDFWQfbjiFHzgw%3BFQp3nwIdgqyj-ymp7tVE4Fy1TDFoMUjBeFvYEA%3BFXwjmgIdjuGZ-w%3BFc3NogIdxsSP-yn5tl_bHkDLTDGS1AGCXGa85g%3BFW5PpAIdHnqA-ykRXPNVRdzMTDF-k9rr5ssHEg%3BFWOzpgIdyRZ6-ymB8BZHsxTNTDFTOjeX0npyyw&oq=malloryt&mra=dpe&mrsp=13&sz=10&via=2,4,6,7,8,9,10,13&t=m&z=8
Any relevant modifications to this route?
Thats a nice looking route
Unfortunately, at the easternmost end of the route, you don't want to miss the Kancamagus highway into or out of Conway, NH.