It would be a tough choice. For me, to play everyday: variety (both types of holes and left/right); not too short, but can be played in an hour to hour and a half (so not too grueling for everyday, and not too much time, but enough to be worthwhile); not much chance of losing discs (manageable rough, grass not very long, probably no water, etc.); relatively clean and kept up; not too busy; no poison oak or ivy; adequate access and facilities; a balance of challenge and fun (not that challenge isn't part of the fun). All of that helps narrow it down...
I think my choices would be, in order:
1.
Prospect Park is a fun, varied course.
2.
Swope Park Can be played in an hour, yet is challenging, but can be busy.
3.
University of OB A bit long, but fun and challenging...and you can see Mt Shasta.
4.
Legion Park has some avoidable water, and at least one hole with tough rough (Hole 7? a blind throw over the rough), but is fun, varied, and challenging.
I could see Waterworks being viable, also.
If RIP'd courses are fair game, the old layout of
Turkey Creek would take second place (maybe 1st) and bump the others down.
3. Waterworks - Just a purely fun course, while still being demanding. One of my favorite settings to play in is large rolling hills littered with trees. I could throw drives on hole 1 all day long.
A lot of the day would probably be spent finding the discs. Hole 1 can be tough what with going out of sight a lot of times, and a decent chance of rollaways. :\