you asked on the poker run thread about priory bay.
It's on East side of Isle of Wight. Just north of Bembridge harbour.
See the cruise planning section and the Priory Bay picnic thread for some more details. there are some aeriel photos showing the way in at low tide, quite shallow in places and you need to follow the right path in or will be stuck. Generally OK at mid tide up though i think.
If you plan on camping over, it's generally classified as a sheltered bay, so your insurance may cover you to have the boat anchored and unattended, but check with them first.
An alternative depending on tides is to go into Bembridge harbour and use the beach on the left for camping and anchoring. alternatively camp there and use the visitors moorings for the boat. Could also use visitor moorings and camp at Nodes Point (again details in the bbq thread).
Some info on Priory Bay and Bembridge harbour at www.solentribster.com
under solent locations.
Hope this helps.