When I went to Canada about 8 years ago,My brother a Canadian National,took me around Ontario,and further.I was advised to tip at 10%,and although not compulsory it IS expected.The main thing to remember is do not leave your small change as this is classed as an insult,and have had to scrape the tip together.This is in the Ottawa/Toronto areas.
Two tips for you...be prepared to spend a lot of time watching the Falls,I spent literally hours.They are totally awe inspiring,and beyond any real description,the sheer noise and power is magnificent.DO please take a trip on "Maid of the Mist" and stand out in the open,you will NEVER forget the experience.Night time is also wonderful with the falls lit by changing colours.
We joined the Casino,for about 15 dollars,this then gave you access to the upstairs restuarant,and with a 10 dollar voucher,you can dine like a King,and revisit the buffet again and again,for such things as crab,lobster,steak you name it it is there,when the waitress comes to collect your plate,hold on to your cutlery for another plateful if you can eat it.ALL the Canadian people I met were friendly, courteous, and honest. It really is so different to this country.If you cross the bridge into America make sure you take your passport and obtain the neccessary permit. Above all see all you can and take lots of photos.
I wish I was fit enough to go again.
Best wishes,
Mick F