Notes: "Aloha" is used in spoken Hawaiian as a greeting or
farewell.
Thus it is the equivalent of both hello and good-bye.
In ASL we just wave hello and good-bye.
So far my contacts in Hawaii tell me that they just use a
big wave of the "five" hand to say ALOHA. One of my friends "made up"
a sign that starts with wave with an "A" handshape. But from what I
can tell, that sign hasn't spread, and so I can't really recommend it.
For now, just smile and do a rainbow-like wave with the palm forward.