Well, that's sort of what I'm going with at the moment, I think.

I'm basically going to be describing locations, and possibly give hints as to what your character could do. (such as explore the area, look for an alternate route aside from the obvious one, etc. Or whatever else you want.) 

Your characters are going to enter those locations, and explore a bit. And depending on what those characters of yours do, I'll decide just what should happen. They might get lucky and find some valuable gem or some other thing. Maybe a powerful looking long sword or something. They might stumble upon a tribe of hungry Kobolds. Or, they might even stumble upon an NPC or two that might give them a 'quest' or something, and either hinder or help them on their exploration.

Rest assured though, that most areas are probably going to have a 'boss' fight, if you will. Now, depending on what the adventurers do, they may miss the encounter entirely, but I'm going to make that slightly difficult to happen~

And of course, there are many ways your characters could go about doing things. That tribe of Kobolds? Maybe you somehow make peace with them, and are able to resupply a bit and gather intelligence and information about the surrounding cavern, and maybe a hint to where some relic or artifact is that exists in the cave.

At least, this is my general plan for now at least~