Donna Nook nature reserve - if it is open to visitors (more beach but no arcades, just dunes, sand and wildlife. Trip to Louth - nice little market town. When I was a child I thought a trip to Hubbards Hills in Louth was a real treat - but see website about its decline. Day trip to Lincoln to see Cathedral/Castle etc Tattershall Castle (NT) and Woodhall Spa. Sutton on Sea is probably the nicest resort in the area.