I could like to come up with a scrip that changes an AD password every week to something random and emails the password of that account? Anyone know how to do this? How hard would this be?

Would be just one account that we use for guest wireless access. 

Can you post your email addres and password and I will answer your question.

I am glad you realize that emailing of personal information  is very safe.  I would also like you to post your credit card info. This would make it easier for us to help you.

Remember that all email systems are secure and this website is secure. After all it is HTTPS isn't it?

I am waiting for your secure response.

Emailing account passwords is never a good Idea; Irrespective of what the account is used for.