It is very hard to make suggestions - we are always happy to help.
Given the unique location of Frank, you are in the midst of wine paradise with easy access to word renown Napa Valley and also the lesser developed adjacent valleys.
To explore the surroundings, please find 3 suggestions for day tours
2 Valley Loop: Napa - Sonoma
Start your day with the Spring Mountain Vinery experience - Drop into the Valley Floor and stroll in St Helena - Explore Napa and its valley - Circle back through Sonoma by stopping by Glen Ellen - Head back home but stop at the Chateau St. Jean
2 Valley Loop: Napa - Alexander Valley
Drive down to Calistoga - Main Street feels like time stood still - Pick 2-3 of the world renown wineries (Chateau Montelena, Clos Pegase, Castle Amoroso) - Pass through Alexander Valley and branch off to a couple of wineries along the road - Stroll in Healdsburg
4 Valley Loop: Napa - Alexander Valley - Russian River - Sonoma
Spring Mountain Vinery (Pride Winery) - St. Helena (Castle Amoroso) - Calistoga (Chateau Montelena) - Healdsburg (Hanna Winery) - Russian River (Porter-Brass) - Sonoma (Chateau St. Jean)