I have just returned from a holiday cycling the Trans Pennine Trail, this sort of holiday was a first for me and I enjoyed it so much I am planning next years trip. My sister wants to come and she doesn't have as much chance to train as I do, so I'm looking to find a route of approx 200+miles, that is relatively flat (I'm thinking the Fens or Holland etc), with minimum city/town riding and as picturesque as possible. Looking for 5 days on the bikes. Does anyone have any thoughts/recommendations/useful links/recommended books etc?