Cornwall Council have an excellent guide and interactive map of countryside access for walking and cycling and it covers the main routes. The links are:
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The Camel Trail is a former railway line from Padstow to Bodmin and is therefore a level walk and cycle ride. We usually go to Wadebridge which is the centre of the trail and there you can find parking, cycle hire and easy access to the route whether you are going to Padstow, or Wadebridge. Padstow is well known for its attractions but the Bodmin part of the trail is less well known. Whilst the Padstow part follows the coast the Bodmin section follows the Camel Valley to Boscarne Junction which is the end of the Bodmin and Wenford Railway. The trail takes you past the Camel Valley vineyard and just before you reach Boscarne Junction there is a delightful Camel Valley Tea Gardens
Some years ago now, and against considerable opposition the A30 at Goss Moor was bypassed. The old road was notorious for lorries hitting the iron railway bridge and closing one of the two main routes into Cornwall ( the other being the Tamar Bridge). The old road has been maintained and is ideal for walking and cycling especially as an off road section has been added to make it a circular route.
A local walk through the industrial archaeology of the china clay industry. The walk starts in St Stephen and winds its way through the disused mine buildings where you can see some of the old machinery still in situ. It is worth getting the 'iWalk Cornwall' app which is free to download. There is a small charge to then download specific walks, which give detailed directions and information about what you will see on the route as it uses GPS tracking to show you where you are.