@Rflong7 I had to think about that for a while. I guess what makes IP beautiful to me is the overall brightness, the color and texture of the default terrain paint, and the landscaping. Some other worlds have darker or duller terrain, which makes the whole world seem dreary, and I don't enjoy playing in them. I'd like to find a similarly bright and sunny tropical island world, preferably with only one main island, so my sims don't have to spend so much time traveling back and forth between islands on a daily basis.
The issues I'm referring to are just the known issues in IP. Yes, they can be fixed, but some of those fixes leave lots that aren't usable, which is a waste of space. Last time I played there, instead of moving households from houseboats into houses on land, I made the ports into houses on stilted foundations and placed the families in those. But that didn't fix the lag issues, because it's the terrain that's the issue, more than the houseboats themselves, so I had to start over, and move those households into houses on land. I'd like an island world that is usable in its entirety.
I have Sunlit Tides, which is pretty and bright, but it's not very useful for having a professional scuba diver or a lifeguard, or for having your sims live on a houseboat.