There's a bunch of stuff to see and do. Don't get too caught up though. On the U.S. Side there is an Information Building that's very easy to find. They will provide you with the Information that you need. I hope this helps you. Have Fun!
Of course there are tours. It depends on where you are starting from, Toronto, or NY. One day or two day packages. Check on Groupon.com and see what the current best deals are. Most Toronto travel agency have daily bus tours ($25 - $60 person).
There's a few diff of options. One is to take the excursion on the maid of the mist. A boat ride to the falls and back. Second option is the do the behind the falls which takes you down to a viewing platform and then down the tunnels. You also have the option to view it from the tower. Package for all three can be purchased or combination or separately.
There is a tour from USA and from canadas side- the second od better. But i don't know what's the price- not much. 15-20 USD per person
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