I was here in Oct. 2013 and had a guacamole burger.  The burger was very bland, didn't even taste like guacamole and just has no flavor.  Was wayyy overpriced, so was happy I split it with my dining companion.  The restaurant itself is very cute and ambiance is quite nice with the cool surf theme and decor.  The surrounding area is also very nice (Summerlin/Red Rock area), so if you're basically looking for an enjoyable themed place, Islands is nice.  Servers are courteous and helpful.  Maybe other things on the menu are better?  I've had the Kona pie once before and it was good - again, very overpriced, but the portions are big so you can split. That would be my suggestion if you go to Islands - split it and enjoy the fun decor, best of both worlds :)