La Mariana Restaurant & Bar     Longtime owner Annette Nahinu went to the great tiki bar in the sky in 2008, so the future of this popular dockside spot is in doubt. At this writing, though, the puffer lamps, peacock chairs and indoor waterfall are in place and old-timers gather around the piano bar unabashedly singing their hearts out. The food is as period as the atmosphere, mostly grilled and fried seafood and steaks — and poke. Go while it's still there.  50 Sand Island Access Road. 848-2800. 11 a.m.-10 p.m. daily. AX, MC, VS. No checks. $$.