What are the speakers mainly discussing?

W: Brian, have you ever been to Isla Mujeres in Mexico? I went diving there last week and took pictures of some amazing sea life.
M: I’ve heard about Isla Mujeres, but I’ve never been there. I was told that July is the best time to visit because the weather is nice. I just don’t know that I’ll have enough time to make the trip, though. Things are really busy at the office.
W: Oh, I think you should make time for it. It was such an extraordinary experience. I can tell you all about it over lunch now.