Here is a suggested route, which shows other caches you can bag on the way round:
Then do Parnholt loop 1 to 4
Then backtrack for Parnholt 5 to 13
On the way to Parnholt 14 you can do Chilihouse's Battle of Britain (GC23Q3X)
Then it's Parnholt 14 to 17
Please replace all caches as found and log any interesting aspects/photos of your walk round.
A quick there and back to bag ‘Up, up and away’ and a look at the grass airstrip (GC3DTKK)
If you're up for a further extension then continue on to 'Church Micro 4878...Farley Chamberlayne' (GC4W7TD)
Then backtrack for Parnholt 3 to 10
On the way to Parnholt 11 you can do Chilihouse’s ‘Battle of Britain’ Multi (GC23Q3X)
Then it’s Parnholt 11 to 15.
After which, visit the 'horse monument' listed on the bonus page and do the virtual Farley Mount trigpoint cache 'Ye Ole Survey Monuments': GC45CC - YSM045 Farley Mount, see also http://www.yosm.org.uk/ (with thanks to 'qrang' for pointing this one out.)
Finally, there’s the bonus cache.
Please replace all caches as found and log any interesting aspects/photos of your walk round.