Does that castle and lake remind anyone else of the setting around Hogwarts?
Recycling settings from some fictional medium to your game is a cheap and easy way to fill things out without too much work. You don't need to spill the beans to your players. Just imagine in your head that they are travelling to a land like The Shire from The Lord of the Rings, or entering a city like Ankh-Morpork from Terry Pratchett's Discworld, or heck, landing on a planet like Dagobah. Now (assuming you're familiar with the fiction in question) you can describe those places in reasonable detail without having to write and refer to copious notes or thinking up a lot of stuff on the fly.
And if you do it well and file off enough of the serial numbers—telling the players how their characters enter the bustling, grimy medieval city, pass a dangerous looking neighbourhood with numerous maze-like alleys overhung and shaded by upper floors, cross a filthy river reeking of sewage and filth, and approach a sprawling wizard's college with a great arcane tower—they'll enjoy the atmosphere and never even realise that you're just describing Ankh-Morpork.
Commentary by memnarch (who has not seen the movie)
It is, of course, narratively extremely likely to find a single castle on a whole planet here. Whether in a movie or in a game, it would be a waste of time to require lots of searching for something when it's only in service to advancing the plot, unless looking for the something is the whole point.
I know the "never gets a good parking spot" is an in-comic item, but I really wonder why is this something that's happening in the movie. It looks like there's plenty of room on top to land, and there should be a hangar bay of some kind closer since spaceships are the main transport method in-universe. I suppose the castle might not actually be the destination, only a convenient scenery set-piece, but that just raises new questions.
The trick for getting the bonus Stamina is living that long! 10 years would be a long time to play the same character, and lengthy time-skips are probably infrequent enough to render the benefit irrelevant. I think we've had at least two time skips in the movies of any respectable length; between Episodes I and II and then between Episodes III and IV. Would any character have actually gained from this growth where it wouldn't have been covered by other activities?
Commentary by Keybounce (who has not seen the movie)
[Keybounce's comments will appear here when received.]
Transcript
Yanni: Chewie! Where are we going?!
Chewbacca: There’s a big castle. You can’t miss it.
Rey: On a whole planet? That’s—
Yanni: I see it!
Rey: Can I just take the controls and land to make sure we, you know, land?
Yanni: Sure! Do it like I showed you.
Rey: Chewbacca taught me to fly, dad.
{Rey flies the Falcon in over a lake, landing across the lake from the castle}
BB-8: Have you ever considered parking a bit closer?
Rey: 300 rounds of extra walking a day is over 100,000 a year. That's a free +1 Stamina in less than ten years.
GM: And look at that view!
Rey: Meh.