So sorry to hear.
I didn't have the chance to know ahead of time, but I can relate.
Having been thru cancer, with zero expectation of survival, here is what I would do if I were in your shoes - if this is a definite final diagnosis -
I'd quit my job asap. Travel, but at a slow pace. No planes, just by car. I'd drive no more than a few hours at a time, relax in a spot for a few days until rested and ready to go. Not too many busy busy busy activities, just going at an easy pace with plenty of downtime.
Some time at the beach would be nice. Swim in the ocean, stroll on the sand, relax inside and enjoy the view.
State and national parks, but away from bustling crowds. Deserts, forests, mountains, open grassland, whatever there is to see. Visit farms and say hello to animals. Maybe ride a horse if I'm up to it. No pressure, whatever works on a day to day basis.
Farm markets & fresh food. Art exhibits. Cultural sights, as long as it's not stressful or overwhelming for my weary mind & body. Strolls through moonlit meadows. Taste interesting food. Whatever there is to discover, no need for firm plans or structured itinerary.
Stay up late or get up early, if there are any interesting astronomical sights. Not gonna see them again, and I can catch up on sleep at leisure as I am going with the flow on this, my last trip.
Maybe a nice slow easy bike ride in the countryside, if I feel up to it. Or paddle across a lake. A campfire and a tent, maybe. Or a cabin. A swim in a mountain lake. Go fishing. Hike, if it's not too hard for me. Watch the dragonflies dance just before sunset, and the fireflies after.
Plenty of sunrises and sunsets. Outside, with a meal. This I did when I was full of chemo and able. ... maybe forego the beer & bourbon, just go with the beef stew. Or, maybe eff it, go with the beer & bourbon.
Or how about stopping by a luxurious hotel, enjoy the spa and massage, staying a few days. Burn a few dollars, why not.
If home is where the heart is, I'd eventually go there.
No rush. I've got all the time there is.
And yeah, the occasional run, even if it's a jog. Because it might be the last one, before I go to my rest.
F Cancer.