Flowergirl, it would really help if you indicated budgets, locations (up-valley, downtown?), and the sorts of things you like.
Great ideas for dinners could include anything from wandering around Oxbow Market to the full tasting menu at Morimoto. You can spend as little as $15 on a meal or as much as $500 a person...
Also, for breakfasts... Full sit-down affairs or exceptional pastries? Most people rave about Bouchon for breakfast but that is a pastry joint. For sit-down breakfasts, I'd head to Boon Fly Cafe in the Carneros District.
Boon Fly Cafe
4048 Sonoma Highway, Napa, CA 94559
6534 Washington Street, Yountville, CA 94599
610 Main Street, Napa, CA