I’ve played Gearheart and Hawktree. Both are extremely well manicured and a blast. The black sand And landscape around Hawktree was amazing.
My “hidden gem” isn’t really unknown, just a great course off the beeaten path and is one of the best public courses I have played…
Old Works in Annaconda, MT.
It was a superfund project that cleaned up an old copper mine/facility. Nicklaus design that used the beautiful landscape and some of the remains of the copper plant. It has black coal slag in the bunkers (very soft!). Just an amazing experience for a very reasonable price.