Re: shore diving- Jack's, Eco Adventures, Torpedo Tours, Wanna Dive and Mara's Dive all have or still do lead shore dives.
The entrance to Volcano National Park is at 4000'+ and there is no way to get there from Kona without hitting 4500'. Since you intend to hit there and Hilo on separate days I would recommend you head south on the way to the volcano and check out both South Point and Punalu'u black sand beach on the way. On your trip to Hilo head north and check out the waterfalls and the botanical park. I would not recommend the trip to the east side following diving, wait to the next day to be safe. Both Hilo and the volcano take roughly 2.5 hours from Kailua if you take the routes I recommend.
Those going to Mauna Kea need to follow time to fly recommendations and then some. Airplanes are pressurized to the equivalent of 7000'-8000' I beleive, and the visitor center is at 9000' and the top is above 13,000'. Saddle road is roughly 6500' so I would follow time to fly rules if you intend to visit the east side using that road.
Waipio Valley does have horesback tours you might want to look into. Everyone I've talked to who's done it has enjoyed it.
Have fun,
Steve
The entrance to Volcano National Park is at 4000'+ and there is no way to get there from Kona without hitting 4500'. Since you intend to hit there and Hilo on separate days I would recommend you head south on the way to the volcano and check out both South Point and Punalu'u black sand beach on the way. On your trip to Hilo head north and check out the waterfalls and the botanical park. I would not recommend the trip to the east side following diving, wait to the next day to be safe. Both Hilo and the volcano take roughly 2.5 hours from Kailua if you take the routes I recommend.
Those going to Mauna Kea need to follow time to fly recommendations and then some. Airplanes are pressurized to the equivalent of 7000'-8000' I beleive, and the visitor center is at 9000' and the top is above 13,000'. Saddle road is roughly 6500' so I would follow time to fly rules if you intend to visit the east side using that road.
Waipio Valley does have horesback tours you might want to look into. Everyone I've talked to who's done it has enjoyed it.
Have fun,
Steve