(I only meant to build a little arch that I could order and have as a trinket, the idea being that whatever I put it on would be the "holodeck," but...)
About this creation
Oh, good, there you are. I know it's hard finding your way aboard a new ship, but at least this isn't a critical tutorial.
Welcome to the Holodeck! I'm going to demonstrate its use so you can enjoy it during your off-duty hours without pestering the quartermaster.
As you can see, the room itself isn't much to look at. But the environments it creates can accommodate several people, and like a treadmill, it will allow you to explore without actually moving. Inertial dampers, forcefields and replicated objects work together to complete the illusion.
Here for example is a desert landscape. It's just a default survival training program, but I'm showing it to you so you can see for yourself how the climate within the Holodeck is altered.
Here's a seascape from Risa. Don't worry, you can't drown – you don't have clearance to lower the safety protocols. But I'd towel off before dripping all over the corridor. Captain likes a clean ship.
You can even create environments you couldn't possibly experience otherwise, although this one is normally combined with a pilot training program as a simulation.
And here's a temperate-zone Earth environment. You are from Earth, aren't you? No? Well, once you've seen one Class M planet you've seen them all.
Well, you have some time to experiment. Remember to always save your programs if you want to revisit them! And always use the filename format "Your-name-1." See you in Ten-forward!