mahasamatman

Technically, an open jaw is A-B-C where A-C is shorter than either A-B or B-C. For example, SFO-JFO-LAX is an open jaw, as would be JFK-SFO/LAX-JFK (where you would have to travel SFO-LAX on your own).

In your example, LAS is your destination, so you can stay there as long as you want. With your one stopover, you could stay over in either SFO or LAX, but not both. If you want to stay over in all three cities, you could do as qasr suggests or book two open jaw awards: HNL-SFO/LAX-HNL and SFO-LAS-LAX. The SFO-LAS-LAX award is only 15,000 miles through the end of the year - we haven't heard if they're extending the short-haul awards yet.