I know this is going to be such a stupid question, but I don't own power tools.
What should I purchase to cut PVC pipes? One of those saws with the straight blade that goes up and down? If so, what is it called?
I'm really embarrassed to ask this, but I know plenty of you will have had experience doing this..
Oh, and is there any softer material that can be used to make caves, which can be cut with maybe scissors, yet withstand having gravel glued onto it?
One more thing. What have you found to be the BEST adhesive to use? I am thinking hot glue gun would be easiest and least messy?

I'm really embarrassed to ask this, but I know plenty of you will have had experience doing this..
Oh, and is there any softer material that can be used to make caves, which can be cut with maybe scissors, yet withstand having gravel glued onto it?
One more thing. What have you found to be the BEST adhesive to use? I am thinking hot glue gun would be easiest and least messy?