What are the most common things to beemind?
From the forum threads I would guess:
Weight,
Sleep,
Reading,
Rescuetime
Maybe the bee-keepers can have a look at the database and offer some suggestions…
(I’m asking in the context of creating a much more user friendly goal starting process tailored for specific goals.)
Based on forum threads, at the bottom, add “gratitude journaly” things and
also meditation.
Off the top of my head for now: Steps is a very common one, or other fitness things like number of workouts, miles run, etc. And Duolingo is popular, but it sounds like you’re thinking about manual not autodata?
mustdo/general tasks is probably another common one.
The things that Beeminder easily lets you Beemind are probably the things that are most commonly Beeminded. So if you create a more user friendly goal starting process, those goals will become more commonly Beeminded! 
This makes me want to start minding woodchucking. 
The sentences were easier to read in my head before I wrote them. 