We went to whitstable last march, when it was still cold and snowing. We stayed at the fishermans cottages for 2 nights http://www.hotelcontinental.co.uk/view/fisher-huts. They were lovely right by the seafront, my two year old loved putting on her waterproofs and wellies and paddling in the sea. The town is pretty has some nice shops and we had a really good lunch here http://www.pearsonsarmsbyrichardphillips.co.uk