For someone close to me - either the cost of dues or I'd gift the points. It sounds like your friend has a price in mind they are trying to fit a Hawaii trip in and if that is a price that works for you - that works.
DO make sure they understand the nature of points - they really can't cancel once you've committed points - and especially if their trip is after your banking window or they cancel less than 30 days out. Airfare to Hawaii is expensive, car rental is expensive in Hawaii (so is gas and food and - well, Hawaii is not a cheap place - and at Aulani they will want a car and the food onsite costs about as much a four year college education - I'm exaggerating, but a $20 for a breakfast bagel - it was a very good bagel with salmon....but it was $20), and you don't want to have wasted points because they discover that its $1500 a person to fly the week they want to go and $1500 for a car. So I'd give them a deal, but I'd give them a deal only once I understood whether their overall budget was realistic.
Thus the car (or a budget for ample rideshare). Target maybe eight miles away and groceries aren't cheap, you can buy a whole LOT of bagels for $20.