knock knock, who's there

From the street where I am living right now, it is but normal to see walking missionaries. They visit every household and preach the good news of the Lord. I have honestly nothing against them but everytime they knock on my doorstep, I politely tell them right away that I am tad busy to be hearing what they have to say. Although, I honestly pity them because you could see them during winter and even on the hottest days of summer. The other day, I was surprised because the missionary who visited our household was offering Christian Cruises. So, I was quite interested and devoted some time on listening to what they have to say. Apparently, these Christian cruises Christian Cruises are authentic sailing adventure on a privately chartered luxury yacht that holds 170 believers. While on board and on the shore, they will be hear bible stories. The particular Christian Cruise they were asking me to join was a tour that will depart USA and visit bible ports such as Athens, Patmos, Ephesus and Pergamum. It will also pass by the ampitheatre where the Apostle Paul spoke. It was interesting, really but I don't think I have enough budget and time to join this type of cruise.