Having received news that a distant relation you have never even heard of before has died and left you a house, you take a long weekend to investigate this unexpected inheritance. No one else can get away for the long trip, so you have to go alone.
There is, as you might expect, a quite unusual door off the kitchen. When you open it with the unusual key you’ve been given, you step through and find yourself…
You find yourself standing on a grassy hill on a beautiful sunny day. Stretched out below you is an archetypal futuristic city of many a utopian imagination. There are tall white buildings, shining white monorails and pavillions, etc. Not to mention people flying around with actual jetpacks.
Nearby, a robot trims the park grass, and some distance away you can see an family having a picnic. The family looks like quite ordinary people, except that they’re all wearing futuristic outfits.
You glance behind you and see that the portal is slowly closing. [added later] And your key is gone. You have maybe 4 or 5 seconds to decide if you are going to lose what may be your only chance at going home, or to stay here in what appears to be a futuristic utopia.
All you have with you are the clothes on your back, a week’s worth of personal medications (if you need them), and anything you would normally carry for a long trip, like your wallet/purse, phone, glasses, etc. All your luggage is still out in the car.
Do you jump back through the portal, returning to your family, friends, job, and position in society, or do you stay and explore?