Hilton HHonors has number of partners and one of them is called Thanks Again that awards you points for dining and parking.
All you need to do is to register one of the cards used and the points are then automatically deposited to your account. For a limited time only, Thanks Again will give you 200 free points for merely registering with them.
You can access this offer on Hilton’s website here (scroll down to Thanks Again).
Here’s the info (sign up before December 31, 2015):
It doesn’t hurt to sign up and collect the 200 points. You may end up using more with the merchants that are part of Thanks Again. I sometimes get random points from the iDine.