Isle Casino Hotel Waterloo – Book your three-night Isle Waterloo stay and save 15%.. Book by March 28, 2023, for select travel dates now through March 2023. Three-night minimum stay required. Blackout dates apply. Must book on promotional code for the offer to apply. Additional taxes and fees apply. Must be 21 years or older to book hotel rooms. Not valid with any other offer. Offer varies by property and is subject to availability. Offer subject to change at any time.