Back on topic, the north end of the Met is certainly a nice ride, but
then I'm biased as thats my stomping ground! The run from Moor Park
toward South Junction (where the line splits to Croxley and Ricky) is
very nice, wide open views across Croxley Moor and the Grand Union
Canal.

The ride up to Watford is pleasant, but you can't see far for the
trees!

Up to Amersham is also very nice, but again for the most part you can't
see much but trees and the back gardens of expensive houses.