Haa.... "The vastness of time and space and I end up here?" I once had a button that said that. I constantly wondered what was out there and where I might go when I was younger. Young and free and all that silly nonsense. Well... it's not really nonsense but it feels like it once you've found something worth more to you.
I have two children... my eldest child has autism. When I swore to be his mother, despite being a single mom at the time and despite the hardships I knew he and I would endure together... I took an oath within myself that I would never leave him until my time here on this Earth was finished.
Unfortunately as exciting as it might be I could not bring myself to enter such a portal. Growing up I read the entire Narnia series and I loved the notion that there were possible other worlds running in parallel or even in unison with our own and that, maybe one day our people might go to that world to see their people. Still... the message within was not lost on me either and call me a dreamer but I truly believe that if I were to find a sudden portal to another realm within my room I would likely leave it alone, even if there was a possibility it never returned, because I'd know that by some twist of fate I was meant to go to that place. And if you are truly meant to go somewhere you will, even if you didn't when you first had the chance.
So I would stay at home. I would be patient and consider my options for protecting my family from this portal. I'd likely set up traps, depending on the position of the portal. I would not send anything into it and I would not make any attempts to lure anything out of it. I've known true danger in my life and I refuse to invite it into my home on some whim.
Now... if I were single with no children? I would pack some useful items like a machete, a couple bottles of water, some fire starting tools, some water purification tablets, a few MRE's, a first aid kit, a bit of rum, a fully mechanical camera, extra film, a couple blank notebooks, a few pencils, a small sewing kit, an extra set of clothes, a heavy coat, a pot, one of those nifty camping plates with a spoon and knife, a sleeping bag, and a pack to put them all in like the sort that army soldiers carry around. (All purchased for cheap at my local Army/Navy store.
) Once I'm ready? Goodbye world!