Gordon
Theres a camp site just on the point a couple of hundred yards from where you get off the ferry from Oban. Theres a very nice pub that serves pretty decent grub, and theres also a little shop just up the road for supplies.
You will be about equal distance from Tobermory and Fionnphart (about 1hr 30mins).
If you have'nt been before, I recommend a visit to Iona and the Abbey, the architecture is amazing, (see how many gargoyles you can spot, inside) the stonemasons were pretty good.
I know you enjoy geology, but Staffa is another level entirely mate, you have to take a trip out there, I did it a few years ago, (I was hoping to take my father this weekend but the weather beat us) the approach is amazing, sealife as well as birds, but the Island itself ! awesome, and the cave, has to be seen to be believed, you can walk a fair distance in, its worth it.
Enjoy
Stephen