Kent sites

Hi all. We usually go away in our van once or twice a year, to my Dad's in the Lake District [he has an orchard we can camp in for free] or to Scotland or Wales. We also use our van as our only vehicle for day to day driving about as we can't afford two. We'd like to take advantage of the odd long weekend and take Daisy away in our home county of Kent, so does anyone have a favourite site they would like to recommend to us? My ideal would be a site with a stream if anyone knows of one, with plenty of trees... Cheers, Grace
[who feels the mountains in Kent are very poor quality! lol]