Well, we completed out Napa Winery cruise over a slightly extended labor day weekend. Thanks to all who responded and helped! A few useful things we learned:
1. Napa Valley Marina is a 'working' marina (haul outs and maintenance during the day) but very very quiet at night. Cost was about ~$20/night to tie up at the guest dock, and there is a well-stocked store for water and ice.
2. Don't plan to take taxis in Napa. Just rent a car. Taxi was $25 one way to go only 2-3 miles!! Just rent a car, at about $50 per day. Enterprise will come pick you up at the Marina and drive you to their shop.
3. There are several wineries within about 5 miles of the marina. Domine Carneros is a great place for food and a relaxing, sitdown drink. We liked the Pinot Noir at Arcadia, also close to the marina.
4. Driving about 30 minutes north to Yountville is really where the action is. A ton of Wineries and a *beautiful* town. Just walking around downtown (and letting the effects of all the tasting wear off...) is great fun. More wineries than you can count within about 3 miles of the town.
5. Ran soft aground in the Napa river, *mid-channel* mid-tide when low was still +1.1. We were able to power out of it, but going through the river on a rising tide is definitely recommended, as is following the directions on the Napa Valley Marina site (which served us well).
6. Six cases of wine makes a boat a bit crowded, unless you have a larger boat than ours... so plan accordingly.
Overall a great trip -- and highly recommended!