Don't know what to do. . .

I think you have missunderstood why Aley built privateer in the first place. It wasnt so much to showcase her skills, under other names she has high quality stuff all over the grid. She insisted several times that privateer was built to encourage others, to show just what could be done. I'm sure that if she thought she was intimidating folks from building with her style, privateer would be poofed in days. She loved her builds, and bent over backwards to help others learn the tricks of using megas and texture.

Imitation is the sincerist form of flattery

you kind of look like the guy that had a plot on maeshil near me for a while.

A few months into my second life, I started to realize the limitations of the old home sim, and began to look for land that I really wanted. One day, while browsing the map ISO waterfront I felt I could afford, I found a 3k plot on a lake that was almost, but not quite perfect. I stood on it for a few minutes thinking about making the purchase that would have pushed me into a new tier bracket, when the sun started going down. When I saw the sun set over the lake, I clicked "buy" without a second thought.

Since then, I've bought out neighbors moving on, nuisance plots, malls, shops, and clubs. I've sweated over auctions and sniped snipers. I've petitioned the Lindens for clean ups and waited patiently for their attention.

On my mainland sim, there are no nuisance plots, eyesores, or lag, (other than what I might be in the process of creating myself--some of my experiments have gotten unwieldy.)

At various times since I've owned property there, It's been a home, a hangout, and an urban wasteland. But mostly I share it with friends who hang there, and a few who have operated commercial ventures there. Sharing with friends keeps them around.

I still don't own the whole region, but I get along well with my remaining handful of neighbors, and I can see a time when, I probably will.

Here's my problem.

Currently, except for a few builds belonging to friends, the land is primarily a personal sandbox. I'm not exactly unimaginitive, but I AM a bit fickle, lazy and, um. . .something just seems to happen between idea and execution.

Basically, I can't think of something I WANT to do strongly enough to be sure I'll actually see it through.

I have do have some thoughts. I've been impressed by some places in SL. Caledon, Suffugium, and Privateer Space, to name a few. I know that I want to encourage the sense of community that's existed in the past, and to a lesser extent, today. I want to give back a little, (With a roadside rezzing area, for example.) I want it to be different, and noteworthy.

Tall order, I know.

SO. . .for the obligatory question. What would you do with two thirds of a sim?

Hmm if you can't force yourself to do it, you probably won't finish it, but no point stressing, just enjoy the bit you do enjoy, no point turning it into a job unless that's what you want to do.
If you want to get into rentals start renting cheap then raise prices on remaining empty plots as they get fewer, and provide service, land radios, help for new shop/home owners , skyboxes above their stores etc.

HEY!!! WADDAYA GLANCING NERVOUSLY AT ME FOR?!?!?!

i'm the MASTER of unfinished builds!

I personally love caves, with interesting prim and texturing. I haven't done one in a while but I did one a while back when one of my friends first had a sim it had interesting look out points and even face built into the rock that which was sort of very cool accident.
Inside it had little water fountain like puddle and small jail cell for naughty elves.
If I had space I probably do low prim maze cave type build again at least for temporary build just for the fun of it.

How are caves made, I was thinking about this the other day. I mean it's not possible to terraform a cave is it, so how does it work?

You either build a prim surface over a hollow in the ground, or have a fake entrance that's a teleporter to an "inside the cave" skybox.

HEY!!! WADDAYA GLANCING NERVOUSLY AT ME FOR?!?!?!

i'm the MASTER of unfinished builds!