Watkins Glen is in the heart of the NY Fingerlakes area, and there are tons of great things to do there. I know this since I was raised in Ithaca (on the road that goes from Ithaca to Watkins G) and went to Cornell, in Ithaca.
You definitely want to go to the Ithaca Farmer's Market. I have posted here about that several times, and it is a definite "not to be missed".http://www.ithacamarket.com/
It is only about 30 minutes from WG. Take rt 79 from WG to Ithaca. Ithaca is a really nice place to visit in and of itself. There is Taughannock Falls,http://www.taughannock.com/
one of the fun things to do is to go to the cornell orchards, although, if you hit the farmer's market, there will be plenty of apples.http://www.hort.cornell.edu/departme...rds/sales.html
There is also the Cornell Lab of Ornithology, which offers great trails and lots of birdwatching:http://birds.cornell.edu/
Ithaca College is also very beautiful:http://www.ithaca.edu/
If I'm not mistaken, The Farm Sanctuary is actually in the area of Lodi, Pen Yann. Seneca Lake (WG is at the bottom of Seneca Lake) has wonderful wineries up and down both sides (as do most of the Finger Lakes, including Cayuga - Ithaca's lake).http://www.senecalakewine.com/http://www.cayugawinetrail.com/
I wouldn't miss doing some wine tastings. Right in Penn Yann is Glenora Winery, which is one of the biggest and the best.http://www.glenora.com/gazette.asp
I really like Lakewood, which is on Seneca Lake closer to WG.http://www.lakewoodvineyards.com/
I know a lot more about that area of NY. However, there is something that I believe is simply a MUST for anyone heading through that area. It is one of my favorite places in the world, and it is, basically, right on your way to Virginia. That place is Longwood Gardens, just south of Philadelphia. I can't begin to describe it, it is pure magic. Here is the site:http://www.longwoodgardens.org/
I really hope that you decide to go there. It is really right on your way, and well worth it.
I hope that this gives you lots of info.