I've been staying at Hilton hotels around the world for the last few years. One of the reasons why I use Hilton more than any other hotel group is because their Hilton Honors (sic) program is pretty good. You earn points with every stay and you can cash those in for free hotel nights, but you can also earn airmiles. So if you stay in a hotel for one night you might get several hundred Hilton points AND a couple of hundred airmiles.
A couple of years ago I was able to use the airmiles and points to spend 3 or 4 days in New York. I flew Dublin to New York business class, stayed in the Waldforf Astoria in Manhattan and the total trip cost me $20 or something (excluding meals, transfers etc).
For the last two years I've been at the top tier of their frequent traveller program, but they'd never sent me an actual physical card for some odd reason. You don't actually need the card, so it wasn't a big deal, but it was nice to get my card delivered this week. Whether I'll be able to maintain that status next year or not remains to be seen - a lot depends on where I'm going and which hotel is the best for the event both in terms of location and price.