Here's another route to consider if you have a transponder. It takes you through Canada entoute to Geneseo NY as previously recommended and which is the longest grass warbird field I have ever seen and which also has a neat little museum onsite.
Enroute, you stop at Hamilton ONT (CYHM) to clear customs and see the Canadian Warbird Heritage Museum. This is worth the trip in itself. Coming back into,the US you clear US Customs at KIAG, Niagara Falls International, then head on to Geneseo. The only reason I mention the transponder is that crossing the border without a transponder requires a waiver that is a PITA to get. BTDT.
http://www.warplane.com
The route is reasonably direct and avoids over water legs, takes you to one huge and one interesting small warbird museum, and you can overfly Niagara Falls (after clearing customs and getting the briefing at KIAG.)
What you do after departing Geneseo for gas and interesting stops is beyond me.