The caches are a mix of containers with a few of them being large enough for swaps. Most should be straightforward allowing you to concentrate on the walk and the views.
Parking is available in Chedgrave and at a number of places on the route, please do not park across field access points or in passing places.
You are looking for a small flat round plastic box with small swaps. From her you can see Hardley Mill (where you can find Hales Hikers' cache “Hardley Drainage Mill”) and the Yare Valley.