Well, worth going for a burger and beer anyway.

We stayed here last year http://www.winecountryfarm.com/
My wife is not typically a B&B person, but the location is great and it was perfect for us and another couple (located right above Archery Summit and Domaine Drouhin, both 'must-dos')

Others have give good advice and resources, but for a couple 'out-of-the-way' wineries, I'll add:

Elk Cove
Adelaide (Great views)
David Hill (Wife's uncle was original owner and she used to spend a week here every summer...neat in that he was one of the first to grow wine in the area)