For me, about 90% focus on the road ALL THE TIME. If the view is good ... PULL OVER and get out the camera. Take a break, take it all in. Relax.
My riding group repeats routes year after year, we have designated pull over stops for taking in the view, pee, water and Photos.
These can be from 10 minutes to 20 minutes. Then, back on the road with a vengeance and 100% concentration on the road.
Certain roads allow you to relax a bit ... if boring straight sections. But if your averaging 100 mph on those sections, then I'd advise 100% concentration on the road ahead.
Biggest modern day distraction lately are guys trying to read their GPS and ride at the same time. TWICE we've had guys go off the road. Luckily neither guy went down but way too close for comfort.
GPS is as bad or worse as Texting. And we all know what that gets you.
A few pics from our chosen stop points:
What are they looking at?
Some BIG BOYS!
Lake Tahoe distractions ... eyes front!
Mojave views with friends
On the way to Death Valley ... this bit is WAY steeper than it looks. Knobbies please!