karl, I havn't been to the site for a number of years but go the Seadown beach once or twice most years. From the site to the beach is a very short stroll and there is a good pub at the beach. It is typical of West Dorset that is pebbles.
Take it easy on the "road" from the A35 to the site. Nothing too much to worry about but it is narrow in places but the DA of the C&CC that I belonged to used it and we all got in and out ok.
Have a great time in Dorset, the weather is good here this morning. Try not to add to the coffers of the Dorset Camera Partnership who are lying in wait to greet you.
Ray