>>If I were you I will go to an extremely inconvenient experience with my girlfriend, like for example crossing the Atlantic on a small rented yacht or camping for a serious amount of time without the comforts of civilization. I have done this myself and it is extremely useful.
Unless you plan to spend your entire married life on a small rented yacht, it's a silly idea to use it as a "trial run" for marriage.
I've seen similar practices backfire many times. What happens is that the adversity of the adventure brings the couple together and helps them bond, but when they return to their regular lives they grow resentful of each other because they no longer have the Adventure Stuff to distract them from their actual issues.
Unless you plan to spend your entire married life on a small rented yacht, it's a silly idea to use it as a "trial run" for marriage.
I've seen similar practices backfire many times. What happens is that the adversity of the adventure brings the couple together and helps them bond, but when they return to their regular lives they grow resentful of each other because they no longer have the Adventure Stuff to distract them from their actual issues.