If you are looking for inspiration on holidays in Shetland you need look no further than Laurie Goodland.

Read her blog about The Lodge and Fetlar https://www.shetlandwithlaurie.com/blog/the-lodge-fetlar-a-review-and-itinerary-for-your-stay

For wildlife guides Brydon Thomason runs a wildlife company that provides guides.
See https://www.shetlandnature.net/about-shetland-nature/meet-brydon-thomason/

The Fetlar Community Assocation web site has a lot of useful and interesting information: www.fetlar.org