Wow, here's one I actually don't like
Blah blah my second island's is small round, bottom left corner, it's good it's great, blah
Now that's out of the way, my first island's peninsula (straight top, it's an okay type for what it's worth) is one of the best cases of wasted potential, literally because of where it ended up.
(other case would be the rocks in the back...)
It's shoved on the top right corner of my island, by the second level cliffs (which I'm not going to knock down), and there is absolutely nothing I can do to work around it. It's a hybrid flower hoarding ground because I don't really decorate with flowers but I don't want to completely get rid of them
(rip feature where they could sit in storage or be used as furniture, WW to NL)
If it had spawned on the left side instead of the right side, I'd actually have a use for it. But instead, it's remaining a useless little chunk of land in a sad little corner of the island.