What would be a good cruise next summer for my graduation?

My parents will take me on a cruise for my high school graduation next summer, they need to know where I want to go soon so they can book early. I've looked at cruise lines such as Royal and NCL so far and some trips have looked interesting like Alaska, East Asia, South America. I like hiking/the wilderness,... show more My parents will take me on a cruise for my high school graduation next summer, they need to know where I want to go soon so they can book early. I've looked at cruise lines such as Royal and NCL so far and some trips have looked interesting like Alaska, East Asia, South America. I like hiking/the wilderness, cultural experiences, something more adventuress and scenic. I've never been on a cruise or left the United States before. Are there any locations or lines you would recommend?
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