The Fife Coastal Path starts from North Queensferry and finishes at Newport-on-Tay linking the coast between The Firth of Forth and The Forth of Tay. Different web sites give different total distance, but there is some consensus on 82 miles.
I have booked a rail ticket from Arnside to North Queensferry for 29th March. This will be a valuable first backpacking trip of the year staying close to civilisation whilst providing apparently attractive walking - it should take less than a week, allowing me to make any required fine tuning before my Welsh border walk starting on 20th. April.
The route includes a short section called The Chain Walk utilising a series of chains and ladders fixed to the rocks. Due notice has to be taken of tides.