It's no problem at DFW to leave and re-enter. You're checked bags should get checked thru from HNL, so no worry about those. And security at DFW is easy, on a Tuesday afternoon, it'll probably be 5 minutes or less to get back thru. I don't think there is any bag storage, so you're best bet it to head to the lobby of the Hyatt hotel (attached to terminal D, the international terminal that you will depart from) and ask the bell desk to store them. If they give any push back, a tip should solve that.

There's a couple of other recent threads here about what to visit during DFW layovers.