Can't help with the northern half, but we did find both Lewis and Clark Cavern SP and Bannock SP quite special.
The Lewis and Clark Caverns campsite itself was nothing special, but the setting was excellent and the caves themselves were fantastic.
The campsite at Bannock was quite nice (private sites, a stream right along the edge) and wandering in to a ghost town in the middle of the night was quite an experience.
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Doug
2013 Escape 19 ("The Dog House") , 2018 Ford F150
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