My wife and I just spent a week in Waikiki, and the bike racks we saw, I thought were pretty cool. Apparently strong too, since I saw some bikes that had obviously been locked to them for a long time, with nothing left but a badly twisted frame. Anyway, here's the rack:
These racks were everywhere in Waikiki, not so common in other areas, and they were heavily used. We had to look to find one without bikes locked to it. We didn't get to ride while we were there, but in that area there were a lot of tourists renting and riding, and a lot of locals riding. Mostly mountain bikes, mostly junk, but a few more dedicated riders including a few roadies. I rarely saw a helmet used, but apparently no helmet law, since motorcyclists didn't wear them either. A few "wrong way" cyclists, and a fair number of sidewalk riders. The streets are in pretty rough shape in a lot of areas, but for the most part it looked like cars gave bikes plenty of room, I've certainly seen worse. I saw a couple of shops that catered to triathalon bikers, and visited one that was actually closed but let us come in and look around anyway.
Mostly wanted to share the bike rack, cause I thought they were cool.