Some info now: Our boat is a 1992 20' Celebrity 200 Cuddy Cabin w/a Mercruiser 5.7L I/O (350) engine.....so, it can "get up and go", but most have it at a lower speed. Have had the boat since April 2009 and numerous repairs/replacements done on it. We are both close to 70 yrs old.
Anyway, here are a couple of short stories that happened to us, concerning guests:
My wife, with me agreeing, invited a much younger couple to go for a ride with us on our boat at The Landing in Jacksonville. The current there can be sort of rough and there was some small waves. They were there when we got there from storage. Gave them each a vest. The wife, of the couple got in first, and I could automatically tell that she was scared. "The only boat we've ever been on is a cruise ship." she told me. Before he got in, I immediately told them, "I'm sorry, but we can't take you with us." Fortunately, they boat completely understood and she got out and they gave us our vests back.
Then, back in Colorado, my wife was going to invite a co-worker and her husband to go on our 1989 16' Invader Bowrider. I had met the lady and knew she was fairly obese and told my wife "sorry, want her weight as my responsibility. Wife completely understood and gave the lady and some excuse about why they couldn't go with us. The lady accepted the excuse.
Also, while in Colorado, another of wife's co-workers, and her husband was asked to go out with us. Thing is with them, they use to own/use a Bowrider. Took them out, beached the boat and had a good time talking/eating and a couple of beers on the lake beach. Had absolutely nothing to worry about with this couple.
Now, living at the apt. complex we're at, we know of a single older (63) man who has expressed a "like to go with you" to us. Our boat was in for repair and we told him that. Also, our next door neighbor, a short/plump type and her 13 yr. old daughter has expressed the same. The mother told me that she's been on a pleasure boat before.
Don't really know about either of them.
Since we've lived here, it's only been wife and I on our boat. .