I don't really understand why every Age needs to have a storyline with puzzles and such.
Justin, as I read it, you are very interested in writing a link to that landscape that you have in your head. Well, why wouldn't that be possible? The D'ni made simple Garden Ages. They just thought, I'd love to have an Age with green grass and some pools that looks pretty and relaxing, and tadaaam, they had a link to Tsogal. The writing process isn't that simple of course, but I just want to make clear that there doesn't need to be any story for an Age to be fun. It shouldn't be an obstacle for writing the Age you want to write.
What you could do is to pay attention to details. Make the landscape and the structures in a way that people can fantasize about it. You should have some basic ideas of what the Age is/was like, implement some hints about that in the Age, and make the explorers think of the rest.
And puzzles make an Age more fun of course. But that also shouldn't be an obstacle for writing the Age. When you're thinking that you need to have puzzles implemented, you may get puzzles for puzzles' sake, which is not what you want.
Also, the Guild of Writers has just started on a larger scale. There haven't been written that many Ages yet, and there are almost no finished Ages. I'd love it to explore an Age like Yinfara even without story and puzzles. We've just started writing Ages, I'm not expecting Cyan Ages yet, and I don't think anyone is. For now, I'd just be happy with seeing some nice scenery. Show what you're capable of!
Just my two cents.