As a German citizen I usually have a visa waiver for the US for 90 days. This allows for side trips to Canada and Mexico (which are counted in the 90 days).
So you can just walk over the bridge, spend some hours or days on the Canadian side and then walk back into the U.S.
Having said that, this may not apply to a Thai citizen.
It depends if you are USA citizens or not. But nevertheless, this site has some useful tips and further links that will provide you with all necessary information for both cases.
btw… this FAQ make me really laughing:
Q: Are the Falls turned off at night ?
A: No
Credit:stackoverflow.com‘
5 Mar, 2024
5 Mar, 2024
4 Mar, 2024
4 Mar, 2024