What are some of the most unique, fun, and adventurous experiences (e.g., bucket list items) you’ve had while traveling?

I’m trying to plan out travel for the next few years and it feels like a lot of what I see online is mass marketed and posted all over social media.

Has anyone had any really cool, unique, once-in-lifetime experiences that they still think about years later?

This could be action oriented like a safari, a cultural event, festival, other private tours/experiences.

This can apply to any country, city, and season.

Thanks!