I'm a little bit rubbish at plotting routes as I tend to have every road blueprinted in my tiny brain but I will try....
From Sittingbourne we cut through Tunstall, Bredgar and Hollingbourne to come out on the A20 to the bottom of Charing hill although we usually take the A251 from Faversham and pick up the 252 to Charing, most times I turn towards Chilham and turn around just before the A28 and ride the road the other direction because it's one of my favourite local roads. Once at the bottom of Charing hill I turn towards Ashford along the A20 and take the turning to Pluckley (Ooh scary) Some lovely little twisties through there especially if you take the right fork past the village through screaming woods on to Headcorn aerodrome which is a good little stop off.
From there you can get on the A274 towards Tenterden and on to Rye, again, some lovely twisty roads all around that area or the A28 towards Ashford is pretty decent.
We headed back the way we come from Headcorn through Pluckley and Charing, Challock, Chilham, cut acroos through Shalmsford street to the B2068 and picked up the old A20 into Folkestone which always seems to be deserted and is pretty fun.
Some pretty good bends just before the Spitfire memorial at Capel le ferne going up the hill and the same heading back towards Hawkinge. Sometimes I like to get off the beaten track and explore the lesser used roads, however sometimes this doesn't always go to plan and an enduro would be better suited.
Hope this hasn't confused you too much.