Challenge: Great outdoors, mountain, moorland, woodland & hills.
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It would not be a pleasant journey. Not one step of it would he enjoy. Not mountain, nor moorland, woodland or hills. He would be sad starting and sad reaching his destination. Well, his destination in this life anyway. Every step would be a step away from life as he understood it.
Then would come the journey to the life beyond. The Great Voyage.
As to what came after that… who would he be, what would he be, in that place?
Thranduil realised he had already taken the first step; he now saw the journey as one he would make.