I find volcanoes fascinating!
Me too. It's crazy how the crust of the Earth ruptures and allows hot lava, ash and gases to escape.
It's weird how that all works. What causes a volcano to erupt?
The erupt due to the Earth's crust being broken into 17 major tectonic plates that float on a hotter, softer layer. 
That's all really interesting! I hear that they're formed because of the plates colliding with each other. Is that right?
Yes, but volcanoes can also form where this is stretching and thinning of the crust's plates.
I'd love to go and see a volcano in person! Any suggestions on which ones are safe to visit?
Sorry. I can't suggest one, but the Northern Cordilleran Volcanic Province is the most recently defined volcanic province. 
I wonder what the largest volcano is?
Not sure, but the NCVP spans over northwestern British Columbia, central Yukon and The easternmost part of Alaska.