Sorry I didn't see your original post. Don't know if you will head back to that area, but here are a couple of comments.
There are SO MANY wineries, and I haven't spent much time visiting them.
If you like whites, I would suggest REIF. I have especially liked their Vidal, Gewurztraminers, and Rieslings. Sorry, but I'm not a fan of Chardonnays, so can't comment on those (ABC - Anything But Chardonnay.) At a recent tasting, I liked their Kerner. I'm sure I've had some of their reds over the years, but I generally prefer my homemade reds to commercial reds.
Everybody who is interested in good Canadian wines, should visit INNISKILLIN. The first Ontario winery license since 1929 was granted to Inniskillin in 1975. AFAIK, Inniskillin wines were the first made from vitus vinifera wines in Ontario (probably Canada too). Even if you just drive past and say "THANKS".
Steve