If you have Sky Demon, they are all there. If you had already been to Bute, you could go into Campbeltown, and then route up to Coll, Colonsay, then up to Oban and Mull.
Again Coll and Colonsay have hotels, plus some grass for the tent
Also Islay, and you could get the ferry to Jura. Now that is an adventure. Jura used to have a grass field at the beach North of Craighouse, I took a Cub there once, but not sure it still exists.