I need ideas to keep the date fresh Bf surprised …?

My boyfriend and I have been together for over a year and a half and make things interesting others all the time, but …. I want to keep it in your toes and do something I never forget. (but not too expensive) he really likes: skiing, music, sports, etc. Also, I was thinking an idea of the date, more along the lines of "original"

go on a boat if u live on the sea, go to the mountains if u live in the hills. idk? movies?

Cool Ski stuff