The best adventure games like Just Cause 4 are Just Cause 3, Saints Row IV and Crackdown. Below are 8, each with the reason it is here — and, at the end, what filtering to adventure costs you.
Filtering to adventure means the place and the story are what you want back, not the challenge. It is the right filter when the thing you remember is where you were rather than what you did.
What you get: A world with a reason to wander it, and writing that survives being read rather than skipped.
What made Just Cause 4 worth playing in the first place is covered on the full list. This page is the adventure part of that answer, and only the adventure part.
The tighter of the two, and the wingsuit is unchanged.
Superpowered traversal in an open city with the same silliness.
Traversal-first open world where movement is the upgrade.
Open-world chaos with a grapple and a wingsuit of its own.
The other great blow-everything-up sandbox.
Movement in any direction as the core toy.
The best city traversal, if you want it precise rather than absurd.
If the sandbox rather than the physics is the draw.
Mechanical depth. Several of the best adventure games have combat that is deliberately unsatisfying, because they want your attention somewhere else.
Specifically, these are strong answers for Just Cause 4 that are not adventure games, so they are not on this page:
The full list is on games like Just Cause 4 — 9 picks, no genre filter.
Just Cause 3. The tighter of the two, and the wingsuit is unchanged.
No. Just Cause 4 released on the PC & Modern Multi-Platform, but a recommendation is only useful if you can play it, so the picks above span platforms and eras. What they share is the genre and the reason.
Anywhere the story and the place matter more than the skill ceiling — point-and-click, walking sims, narrative thrillers and most open worlds. The label alone tells you very little, which is why each pick here says what it actually is.
They split hard. Open-world adventures run to a hundred hours; the narrative ones are often finishable in an evening, and the short ones are usually the better written.
By hand. Each pick was written for the full Just Cause 4 list first, on what the game actually does, and this page is the part of that list that is adventure — never a genre tag lookup, which is how "best racing games like Super Mario 64" used to be a page on this site.
Or read the adventure guide for where to start in the genre generally.