Is your group is looking to cycle in the area!! Fantastic, I'm a cyclist also. Niagara on the Lake Cottage Rental http://niagaraonthelakecottagerental.com has the cycle/wine route running in front of our cottage!!
We're near Peller Estate Winery,The 2 Sisters Winery, you can cycle on the Niagara Parkway and you'll find at least 5 wineries and if you go down Lakeshore Road, there are another 5 wineries, Niagara Stone Road has at least 5 wineries!!
There are so many wineries for you to visit you won't have enough time to visit them all. You'll just have to come back!