Here are some of my favorites that I personally did not find overboard. I don’t have any visuals, sorry.
Hobowire’s —
@Hobowire inspired me so much. His island had a lot on it but I never had any lag issues. I love how his designs were outside the box (I like designs that aren’t but his designs really impressed me). Special areas of note are santa’s workshop town, haunted house. He also made a movie studio in one of his houses

.
Oak’s I haven’t visited his or @WaileaNoRei’s in awhile. But, both were nice on the eyes and had wonderful atmosphere, not to mention extremely creative.
@oak ’s focus seemed to be a rural area and @WaileaNoRei’s was asian themed.
WaileaNoRei’s
I am unsure if Pyoopi has one, but you can see what her island looks like at her
journal. Her island has a “tropical island paradise/nightmare vibe (nightmare to her villagers).”
Sorry. It has been awhile since i visited most and am terrible describing them. All to me are worth checking out