If dad loves oysters, then a gift of the briny bivalves would really surprise him on Father’s Day. Island Creek Oysters in Duxbury offers free overnight shipping to send oysters from the bay to his doorstep. Available in 50 ($100), 100 ($150), and 200 ($265) count bags, the mollusks arrive inside a protective container cooled with food-safe gel bags. The oysters can keep in the refrigerator up to 10 days, so you can order before a gathering. Shucking knives are also available ($20 and $40). If dad, or anyone in the family, needs to learn to open the tight-lipped shells, Island Creek offers an oyster-shucking lesson at www.islandcreekoysters.com/ico/how-to-shuck. It really doesn’t take long to get the hang of it. To order go to shop.islandcreekoysters.com.