Sounds like a good plan. It looks like you got everything covered. I would bring a couple extra cheap closed cell foam pads. You can get them at walmart for $5. Just incase you guys get cold underneath at night. They make a huge difference.
Para cord will work for a tarp. I used it on mine to test it out. I would not use it as any load bearing hammock line though. It will break really easily.
You could have your son help you hang them. It might be fun for you two to learn together.
Have fun, it sounds like a blast.
Is that too much to ask? Girls with frikkin' lasers on their heads?
The hanger formly known as "hammock engineer".