Chin Ho finally marrying Malia in "Alaheo Pauʻole". A Wedding Day is heartwarming anyway, but when you consider what Chin has been through and the reasons why he ended his first engagement to Malia, it's pretty clear that Chin has earned his happy ending.
The ending of "Kahu". Can be a CMOA too.
Just about anything with Max and Sabrina:
Their first date is ruined when she gets shot during a bank robbery. So, he makes a vending machine menu for her and they have their date in the hospital while she recovers.