I will be on Holiday. Stayed with a company last year called 'Helford River holidays' ,.http://www.holidaycornwall.co.uk/
accomodation within a few metres of the Helford river and you can keep the boat moored on the river for the duration. Once moored you can get out all states of tide(swim to your boat or get the ferry). Loved the place so much that we are going back again this year.
The place is ideal for boat lovers, an excellent base.
I paid for the 'Helford river boats' landrover to help launch my Rib as they do allow cars onto the beach.
If you are up for going to the Scilly Isles then great if you can make it.
It is approx 30 miles from Lands End, but from Helford river where I intend to depart the trip will be about 75 miles each way.