doughnut
Veteran
Here's a route I have used a couple times from Glasson Dock to Warton and back. About 40 miles. Quite a lot of this, particularly the Glasson end of things is not on road which my wife prefers. But it shows the Bay Cycle Way route out of Lancaster to Morecambe - its all cycle path and crosses the train line as you get to Morecambe. Once in Morecambe you get onto the promenade for 2-3 miles. Its a great route - dammit, you've talked me into doing it again in the next week or two 
https://ridewithgps.com/routes/30340943

https://ridewithgps.com/routes/30340943