Looking for a fun way to explore Napa? Then I highly recommend renting an electric bike from Fat Tire Bike rentals. The process could not have been easier. The online portal gives you info on the proper bike size which worked out perfectly for our various heights.
They dropped the bikes off at our hotel and gave us a tutorial on how to use the electric bikes. The rental included helmet, water bottle, snack, lock, storage bag and map with recommended stops , routes, places to grab a bite to eat or a glass of wine. We spent 7 hours and went over 30 miles in picture perfect weather. Batteries were still half full.
We did a combination of the vine trail, less traveled roads and some in town riding. When we were done, we parked and locked back at the hotel and they picked up. Super fun.
Tip - include the gel cushion for a couple extra bucks and bring your smart phone. Bikes have a phone holder so you can use the map software app on your phone.