I gave this challenge a shot. I didn't realize that paved landscaping can count, so hopefully that isn't an issue because the house I made was under the limit. I made a nature trail outside when I'd normally install a pool. I was just decorating the outdoors.
Anyway, I ripped down Nookstone in Oasis Springs and put in a Tiny Yoga Retreat since my lot was across from the spa. The sim that lives there will feel like a winner regardless. It'll be tricky if she ever has kids because it's really for one sim with the max of a couple. It was interesting to liven up Nookstone. Oasis Springs has kind of turned into Sedona in my game.
I'm one of those people who are running out of lots and about 200 sims.