G there is tour bus with I think 3 different options on the route.
And there is Jean Ross who will pick you up in her car and basically you just tell her what you want to see and she takes you there. Means you can go to the brewery distillery and have a pint/nip or two. Never been on one of her tours but folk that I know that have were well chuffed and said it was well worth the extra. She has lived on the islands for 40 odd years and knows all the bits and bobs. I think she knows the lady at the Orkney jewellery place and you get a discount as well if she takes you there.
If you don't want to use Kirkwall the bloke that owns Landholm didn't used to be adverse to visitors.
And fuel price depends on where you fill up.
Dundee is OK
Inverness is OK.
Wick the refueller might as well turn up with a highway robbers mask on.
Kirkwall is loganair on request Fuel AVGAS 100LL AVTUR JET A1 Oil
Tel: 01856 872415. Your better to phone them a couple of weeks in advance and see if there is a problem and book your 100litres or what ever you want.
Think they have avgas still in SYY.
Anyway check all that it been a while since I been to the islands in a put put.