Bicycling through wine country requires restraint and common sense. Wine tasting is fun, but you don't want to drink enough wine to impair your judgment or balance. It's not just yourself you have to worry about: Most tours through wine country are along roads also traveled by motor vehicles.
Of course you can stop at wineries along the way. Just remember, you're only there to taste. A good tactic is to swish and spit. Savor the taste, but don't swallow. If it helps, try to sample food along with the wines. Taste only a few wines if you have more riding to do, and try to visit only one or two wineries during a day's ride. Save the serious sampling for the evening, after the day's pedaling.
It's always important to stay hydrated when cycling. If you're stopping to sample wine along the route, staying hydrated is even more important. Alcohol can dehydrate you and make you more susceptible to heat. To avoid this, carry plenty of water and drink it frequently.
What if you find some wine you really like? Keep reading.