We also hit Izu in September and the weather was perfect!  There was white sand beach just like back home and the water was warm.  We were at a beach called Tadadohama, which is right next to Shirahama Beach. 

Shirahama, where we took the picture below, resembled Waimea Bay, with the exception that there are not the same gigantic waves like Hawaii during the winter time when the waves are up. 

We let Joa freely play in the sand as you can see, which he took full advantage of, getting it into his eyes, ears, nose, and mouth of course.  

We took him on the surfboard as well but will save him the embarrassment...maybe later???