AS has certainly priced these well.
In January LAX-EWR rt is $341 and LAX-HNL rt is $361 at the cheapest I think; both can be done same day without a red eye. Unfortunately 2 of each would be 8 miles shy of 20k I believe.

So another option would be 4x LAX-EWR-LAX for $1364. One of those would need a LAX-SFO leg, which usually increases the price slightly, so say $1400 total. But that has no repositioning or overnight costs or redeyes. All to say AS has made it hard to get some exceptional mileage run value from LAX it looks like