Yes. No impact from the rain
It's good actually because it will be hot inside so no worries u can go anytime
We visited on a rainy morning. The initial walk down to the caverns is the only area that would be affected by rain. The majority of the tour is underground after passing through some humidity doors.
I'm sure management would not all visitors if there is a risk of flooding.
The whole walk away inside has that gritty bed liner rubber. Plenty of grip but it does get very steep
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