Cardingmill Valley, track 10 “You can go flat out down there” is not good advice, especially during the day at the weekend.
It’s the most popular route up for walkers, you’ll get on better with them if you go up it 🙂 they cheer you on, but you’ll do well to clean it.
Track 2 is pretty good and not as short as it looks on the map.
All the “descents” on the map are doable as climbs (with the odd push)
If starting from Cardingmill itself I would go:
15
14
12
11
Up to Polebank
7
Along to Hamperley
1
2
4
5 (horrible climb, but it is your last and more interesting than 6)
Then depending on time of day/night I might do 10 or 9 or even back to 14
About 18 miles/3500ft climbing, nice 🙂