Are there any sites that may offer an increased chance of seeing sharks? Reef sharks, white tips, hamme heads, etc... I've read the threads about the tiger spot.
Also, can the knowledgeable please add a few names of sites to avoid in general due to dangerous currents? Considering the dives will be performed from shore with two experienced (but not locally experienced) shore divers.
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Sharks.... any and all dive sites have the possibility of seeing sharks. Yet, in many years of diving in Hawaii I've rarely seen them, except when spearfishing in my youth. Maybe others will chime in with areas they reliably see sharks. They are there, including tigers, but they "hear" your regulator long before you can see them, and it seems to me that they stay just out of visible range.
Dangerous currents.... should not be an issue at most dive sites. If you can safely enter and exit, which in most spots on this island means a fairly calm day, you should not have much issue with
underwater current. Surface current is a different animal in some areas, and generally is wind-driven. If you are an experienced shore diver there should be not much problem spotting wind patterns and near-shore surface current. As a general rule, you
must be prepared to navigate to and from your entry/exit point
underwater in order to avoid long surface swims (which could expose you to "inconvenient" currents).
This brings up the point that most dive spots on the Big Island have just one safe entry/exit point. You must return to that exact point to get back out of the water. This is usually fairly easy if you pay attention to landmarks and compass headings during the dive.
I have experienced fairly strong surface current under certain conditions at Kohala dive sites including Mahukona, at some of the dive sites here on the windward side (the Hilo side where I live), occasionally the south Kona sites. Again, this usually is not a big surprise if you spend a few minutes observing the ocean before getting in; if you see white caps a few hundred yards offshore, there will be strong surface current. It will not be a problem
unless you are forced to do a long surface swim back, which is easily avoided by staying aware of your surroundings during the dive and
navigating throughout the dive. The only areas I might say to avoid would be South Point and some of the East Hawaii sites (which most divers visiting Hawaii are unlikely to dive anyway). The "usual" Kona and Kohala sites are generally safe if you use good judgement.
Best wishes.