It's always the same. Do you want to fly? Do you want to read minds? Would you have X-ray vision? Would you be invisible? Invincible? Do you want superspeed? Super strength? You know, the typical super hero stuff. I'm sure all of it would be fun. With any one of those you could rob banks, save babies, perv out, etc.
It's highly unlikely someone will ask me the generic Super Hero question today, but if they did I would easily tell them that 'I want to make all non-dangerous spiders invisible'. There is no sense in seeing them. The site of them just sparks arachnophobia, which is stupid. Phobias are only justified in our brain, therefore not justifiable to the outside world, and in conclusion, stupid.
For example: THIS IS INSANELY FRIGHTENING

But if we just couldn't see those harmless arachnids, you would have this:

WHICH IS INSANELY BEAUTIFUL.
Think about it.