Sure, guns are fun and it's useful and relaxing to be able to shoot. But after a while there's only so many different ways to make a firearm go "bang" and so many different holes you can put into a target at so many different distances.
But actually doing something different, exciting and meaningful — like walking the Bataan Death March or visiting ANZAC Cove at Gallipoli — you don't do that sort of thing for "kicks" but they are excellent things to do on vacation nonetheless. Not all vacations need to be relaxing and happy. Sometimes it is good to do things that are sobering and unusual.
Like the others that I've listed up-thread, I would gladly do these two vacations in a heartbeat.
I have walked just about all of the Civil War battlefields east of the Mississippi.
In particular I remember a foggy morning when I followed the path the Union attackers took to attack Lee's entrenchments at Spotsylvania, I was moved almost to tears by the time I reached the battle line.
But I do not hold with dressing up and playing soldier, I think it's disrespectful of those who gave their lives, and I've had several heated arguments with CW "re-enactors" about this.
Dress-up play as a POW strikes me the same way.