We did a 1/2 day bike tour for a total of 15 miles. Easy biking with maybe a couple of small hills but no problem whatsoever. Paul was our guide really nice guy where safety is his number one priority which was great. He made us all feel very comfortable especially my friend who is a beginner bike rider, when we finished she said it was one of the best days she had on vacation! Sonoma is a great place to do this tour, not as much traffic as Napa. Paul took us riding in this gorgeous neighborhood of multi million dollar houses, wow! The real estate in this area must be off the charts. We visited 2 wineries, the first was Buena Vista (great place with a great history) and Ceja which also has a brewery which was awesome, kinda liked the beer more than the wine. If you are looking to get some exercise while wine tasting this is the way to go!