If your WiFi was turned on and connected 5 tries would bring up a prompt for your Google login and would unlock the tablet. If the WiFi was off your best and possibly only option would be a total factory data reset.
Download a password storage app. I'm using KeePassDroid which is free, there are many others.
With the app you only need to remember one password (to open the app) then you'll have access to all the passwords you've stashed inside. Some of the pass keep apps will even generate and remember new passwords for you.