My wife is traveling to Tokyo for work middle of September and we are piecing together a vacation with possible diving. If we dive, it will be the Izu Peninsula -- staying at the Hilton Odawara Resort. We have our own gear with 60ish dives (need to update the logs!). I believe the water temp in that area will be around 25C, 77F -- is that about right? I will search the forum for info, but in the mean time does anyone have any tips/recommendations. Thanks!