mcmoonter, do you think that you can provide more info on the riding on Orkney, cheers.
Have you checked the cost of the ferries?
There are two ferries to Orkney. The Northlink boat from Scrabster would I’d imagine still be the more expensive. Check the ferry that sails to South Ronaldsay from Gills Bay, they are usually more competetive on price. It has never been a cheap place to get to.
If you wanted to leave the van and bike around, there is a good Hostel
in Stromness, and a million B&Bs.
http://www.brownshostel.co.uk/
There is another out in Birsay.
http://www.syha.org.uk/hostels/islands/birsay.aspx
and Kirkwall
http://www.syha.org.uk/hostels/islands/kirkwall.aspx
There is another very good hostel on Papa Westray
http://www.syha.org.uk/hostels/islands/papa_westray.aspx
There is a good wee bothy at Rackwick on Hoy.
You can catch a ferry from Kirkwall out to Westray and Papa Westray. As has been said there isnt a huge amount of offroad mountainbiking on Orkney, but touring around the archaeological sites by bike doable as the roads are very quiet. Pick up an OS map and you’ll find the trails I mentioned above. The outer isles like Rousay, Sanday and Hoy are easy day trips. Inter island ferries leave from Stromness or Houton for Hoy, the Northern Isles are served from Kirkwall.
Weather can be unpredictable, there are no trees to break the wind. But when the sun shines it is spectacularly beautiful.