The problem with 'I don't like bird watching or fishing' mindset, is you'll not be getting what you're expecting.
It's not everyday you can pop out of an evening to watch puffins and seals etc.
Or see pods of dolphins while mackerel fishing.
You might even be really lucky, like we were one...
T'is ok they were only temporary ones:-
http://www.bbc.co.uk/news/uk-england-cornwall-27010293
Oh and I can't believe I missed this earlier.
It's The Isles of Scilly, not as the thread title.
It's a fantastic place, assuming you enjoy a 'slower pace' while on holiday.
Getting there
The Scillonian boat is the cheapest, but by jiminny you'll be taking your life in your hands.
It could be millpond flat or so rough as a young'un I passed out and had to be tied to a life preserver...