As was posted here by someone previously, yes you can can use the DTG Grand free. My brother is using my comp at 4Q and he knows he can use the Binion's rooftop, but DTG pool and layout is so much nicer. Anyway, I called DTG today and asked if you showed a room card from another downtown hotel, could you use their pool? Yes, and no need to show a room card. Apparently it is open to the public. At least through the June 5th weekend. I didn't ask after that. 10 day forecast for June 3rd weekend-low 100s!