Of these 4 tracks I have never visited...

[Danzig]

surface-wise, i'd say go to oaklawn. but, at days' end, the other three tracks have a lot more on offer than hot springs, ar can ever hope to have.
if you're looking for the best all-around experience, del mar and santa anita would probably be your best bets. i'd put oaklawn last. but it depends on what else you're looking for.
i've never had a bad time at oaklawn-it's after the racing is over that things get tricky!

if you do opt to ever visit oaklawn, i recommend fisherman's wharf for dinner after.