Besides discounts, I'm not sure if you would consider these "perks", but here are some things we enjoyed as DVC members...free gift (a pin) for booking luau; DVC exclusive blue light up ears at Make Your Own Mickey Ears class (fee); DVC classes like Macarons and Mimosas (fee) where we received an Aulani apron and macarons; an Aulani print and DVC lanyards for touring the 3 bedroom model; we were not able to attend the member celebration, but that sounded fun too.
To receive your gift, please stop by the Disney Vacation Club Concierge desk in the Resort lobby and present your prepaid Lū'au voucher to the Disney Vacation Club Cast Member. To book member events like Macarons and Mimosas, call about 1-2 weeks in advance.