Recommend Deal and Canterbury as mentioned.
Also, Broadstairs. Broadstairs' spectacular coastline has seven sandy beaches and bucket loads of seaside charm. There are fishermen’s cottages, clifftop walks and independent shops lining unspoilt streets. The town was Charles Dickens’ favourite holiday spot and his legacy includes Dickens House Museum. Eateries include smart restaurants, quaint cafés and 1950s ice cream parlours. Broadstairs offers seafront hotels with stunning views, boutique B&Bs and guest houses and quaint self catering properties.