I actually live up here as it happens! If you want any info in particular about aspects of visiting Shetland (inc travel here, what there is to see etc) I’d be happy to pass on info. It’s actually the first time I’ve posted on owlstalk I think (prefer the lurking to the posting)… I tried to pop you a direct message but I’ve not posted enough yet!
As punkskaphil said we get loads of people coming for the birding, that’s a big draw for sure, but plenty other stuff here too, please feel free to ask.