While you might see "passport souvenir stamps" available at a cruise port, you should not put them in your actual passport as it is considered damaging and could potentially cause issues with immigration officials; instead, consider keeping them in a dedicated travel journal or scrapbook to document your trip.
Key points to remember:
Only official stamps allowed:
Only immigration officials are authorized to stamp your passport with official entry/exit stamps.Potential passport issues:
Putting souvenir stamps in your passport could be seen as altering or mutilating the document, which could lead to complications at customs.Alternative options:
If you want to keep a memory of your port visits, consider getting a dedicated travel journal or a souvenir passport specifically designed for collecting stamps.