We're a party of 4 adults starting our Scotland visit in Edinburgh mid-June. Looks like we can get to Oban via train, rent a car there and catch a ferry to Mull-- Tobermory-- in a single day. Does that sound about right or will we be rushed? The plan is to spend four days on Mull. Any suggestions? We love to hike, but we're open to sea & wildlife adventures. Thanks.