Heading down or at least very near to the cycle paths perhaps given the route;
Edinburgh
Duddingston
Musselburgh
Dalkeith
Lasswade
Loanhead
Bilston
Milton Bridge
Penicuik
Eddleston
Peebles
Innerleithen
Walkerburn
and on...
If I can get the day off work it would be nice to try and catch it in multiple places to get photos, then cycle on to next photo stop etc. And cake stops too.