If the lounge is open, I would ask to get a key with access so I can wait there. If it isn't, I agree with the others concerning getting a some free drinks.

Quite a few years ago, I arrived early (around noon) at the Santa Clara Marriott. The manager came out to apologize that they had upgraded me, but my room wasn't ready. He then offered me a free ticket to the close by amusement park (I can't remember if it was affiliated with Six Flags or not.) He then had someone drive me over there and pick me up later in the day. Given how early I arrived, I wasn't complaining or anything (though I was a Plat at the time and had stayed there a few times before.)