Bay seniors who have no interest in opening a restaurant but wouldn’t mind polishing up their cooking skills might want to consider enrolling at the Culinary Institute in St. Helena, in that massive castle called Greystone. No, it’s not the curriculum where you end up with a toque on your head. These are classes in just about every kitchen activity – knives, wine, baking, candy, vegetarian, grilling, chocolate, Asian. One day classes start at around $250. Two to five day boot camps run from $895. If it’s your birthday month you get 10% off. Cooking demonstrations are $20. Public tours are $10.There’s even a class designed for you and your teenage gourmet grandkids.