I'm sure this question has been answered before, but I can't seem to find the thread. My pass expires on the 7th, and I want to renew online now, but what do I do in the ten days it takes to ship it to me? Can I not visit the park? because I've heard the old pass is deactivated as soon as they ship the new one. Thanks!

Just renew online, and print out a copy of the receipt to carry with you.

You old AP still has the "valid thru date", if the old AP is inactivated, just explain to the CM at the turnstile you just renewed, and ask if they want to see the receipt. They will usually override without a problem.

Once you get the new AP, stop using the old one, even if it has a few days left on the "valid thru" date.

For what it's worth, I renew online and my new pass always arrives within four days.