I think MLCMM is your man for the canoeing/kayaking conundrum. I'm sure the local club will hold taster sessions.
Another thing I would recommend is this book:
http://www.amazon.co.uk/Run-Wild-Boff-Whalley/dp/1471101800/ref=sr_1_13?ie=UTF8&qid=1367487335&sr=8-13&keywords=running+wild
I see BW at small races now and again and the book should interest you from a writing and running perspective. I think you will like him and enjoy his take on things.
(Although I should add that you won't necessarily agree with everything he has to say
)