Whitstable is a traditional seaside town, famed for its fresh oysters. It has numerous quirky shops, excellent fresh local seafood eateries and plenty of visitor attractions. The centre has a long high street, with alleys and passages of 18th-century townhouses and cottages. There are shingle and sand beaches, where swimming and other water sports are popular. The Street is a natural strip of shingle which runs out to sea, revealed at low tide, when you can walk out along it and swim either side. The beaches have no promenade, making them less busy than other seaside towns. Walk along the seafront and over to the working harbour to watch the boats come and go. From the harbour, sailing trips are available to see abandoned WWII sea forts, a wind farm and to go fishing and seal-watching. The Swale National Nature Reserve, on the Isle of Sheppey, is just across the estuary. The popular Whitstable Oyster Festival is an annual event held in July.