I went to Bryher the smallest of the isles about a month ago and fell in love. Its hard to believe that it is part of the UK. The beaches are stunning white sands and beautiful blue / green seas. We visited the main island and Tresco all equally beautiful with their own charm. My heart is still with Bryher though is is unspoilts and quiet with only 80 residents. There is one shop and post office, a cafe, hotel with restaurant and bar open to everyone. I particularly like the Fraggle Rock Bar. Must try the Rattler! It can be a little expensive if you are buying food from the shop on Bryher it is a good idea to take the boat (£4 return) to Trescos to stock up from the larger store. There is no real roads or traffic everywhere is in wlking distance as the Island is about half a mile wide and a mile and half in length. If you go in April you will find most beaches are deserted and the sea is relatively calm so it is safe to bathe. we had a lot of fun with the dingy. There is plenty of boat trips available to the other islands. there are a variety of fishing tips. As the journey is almost 3hrs on the boat it is not advisable if you suffer with travel sickness and it is worse on the way there as it is back however the plane takes about 15 mins. The place is extremely pet friendly, we took the little rottweiler.
If you are thinking about it do it its just beautiful.