Romantic gifts

Hello,

My fiancé is the most amazing person I have ever met.

He’s always going everything for everyone else, yet despite going though a hell of a lot of crap he always puts others first.

I’m wanting to get him an out of this world break away/experience. Something amazing!

Anyone got any recommendations? He’s not really a materialistic person. He doesn’t ask or need anything. I want to get him or do something memorable.

He loves nature, space, the sea, been in the country etc

Help, any ideas?