Ask @TheKashifSnail:

A portal to another world opens in front of you. You don’t know how long it will stay open or if you’ll be able to get back after you go through. What do you do?And which world would you choose ? A reminder , you might not be able to get back again !

Put on my best clothes that'll last, pack essentials and my video camera, leave a note behind for my family and friends, and go into the portal. Might as well go in while I have the chance!