*raises hand* I was born and raised there.
Depending whether you want to visit a busy island or a quieter island,
Maui
- not as busy as Oahu, but not as quiet as Kauai
- Haleakala
Oahu
- very busy
- Waikiki
- Diamond Head
- North Shore (where I grew up)
- Polynesian Cultural Center
- Sea Life Park
- Waimea Falls Park
- Hanauma Bay
Kauai
- very quiet
- beautiful beaches (well all islands have this

)
Big Island
- very quiet
- volcanoes
- macadamia nut factory / farm
- Hilton Waikaloa Village (my fave)
I know the most about Oahu. There's a lot more to do, but this should get you started. Also, are you planning on bringing your pup? Because if you are, Hawaii has strict quarantine laws so make sure you read up on the requirements otherwise your pup could end up in quarantine. But if not, happy researching!