Do you have any shuttles to Niagra Falls? If not what is the best way to get there?
I don't think they have a shuttle. It's around 35 minutes (26 miles). It's easy to get to though and the hotel will give you directions.
The best way is driving or taking the bus. You can check Greyhound, Coach Canada/Coach USA/Megabus for options.
Get an answer from Holiday Inn Buffalo International Airport staff and past guests.