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Hope I can help.
Pianemo area is one of the best area to dive at Raja Ampat.
If you stay at waisai island it takes 2 hour to go there by fast boat.
So if your home stay don't have boat trip to the area on sunday, i think you better stay around the island.
You can snorkeling also in the waisai island.
If you go to pianemo area, you can dive and also hiking to the top of pianemo hill.
There 3 hill around pianemo, the Pianemo Hill, Star Hill, Manta Hill. Usually people go to Pianemo Hill and Star Hill.
The recommended dive site :
Blue Magic, Melissa Garden, Manta Point, Cape Kri, Mioskon, and Sardine Reef.
Also you have to try dive at the arborek jetty. There thousand schooling fish who can make you feel amazing.