Big Millhole Woods is part of the Woodland Welcome scheme and is crosses with numerous public and permissive paths. All of the caches are places very close to the path so as not to offend or disturb the natural surroundings. There will be no need to trample on the carpet of bluebells in Spring.
The woodland is very mixed with oak, pine, beach and yew etc. and will be a picture in Autumn. We have frequently seen deer while walking here. The walk which should take you about 90 minutes or so at a leisurely pace is extremely dog-friendly with no stiles and no livestock and only a 150 meter section of a very quite lane to worry about. You are therefore quite likely to encounter some dog walking 'muggles'.
Although through woods, the paths are reasonably wide so GPS signal is generally good. The positioning of the caches should keep you on the correct path. Some paths will be muddy in winter. Regrettably this series is not accessible to wheelchair users.
There is off road parking for a few cars at N51° 03.818' E000° 13.893'
Good luck and...Enjoy!
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While you're here you could also try HHW Revisited nearby.