Maeda is a very popular site but get there early because parking goes fast.
Onna point is one of my favorites. Onna has a very strong rip tide during tide changes so be careful.
Bolo point is another favorite. It is probably one of the deepest shore dives. Since Bolo kind of sticks out on a peninsula it can be tricky getting in and out because of the water conditions. Only dive there if you see locals diving.
Toilet bowl and horseshoe are also very good.
Sunabe sea wall is very popular. It's a shallower dive with great soft corals.
Channel crevases on the south end of the island is really cool. In the summer the winds usually come out of the south and can blow this site out.
I did Hedo Misaki at the top of the island once. Its a long drive and the diving is just as good closer.
I haven't dove Ikei Island but we have lost a lot of divers here. I'm told the currents are very strong.
I dove around Ie Island on a boat but haven't done it from the shore. Most of the diving around Motobu is boat diving. There is a site we call Gorilla Chop, it is next to Three Rocks, that is accessable in almost any weather condition. There's not much to look at but if you got to get wet and all the other sites are blown out you can probably get in here.
I haven't dove that much on the Pacific side. Oura Wan Bay is a long snorkle and pretty much dead. I think I was at Gesashi Loran or maybe a little north of there (hard to say...its pretty much jungle on this part of the island). Again it was a long snorkle.