If you’re in Sin City and yearn for exciting exercise, consider this wet and wild adventure. Take some time off from casino card sharks to swim close up and personal with actual, living ocean predators. It can be an enjoyable experience in the hotel’s expansive Shark Reef.

To participate, you must be dive-certified and at least age 18. The program includes up to 45 minutes among sharks, stingrays, turtles and other undersea life, with all protective and air equipment furnished. The fee for one diver is $650, or $1,000 for two swimming together, and includes videos and photos to record the memories.

Dives are available by reservation on Tuesday, Thursday, Saturday and Sunday afternoons. For more info and bookings, go to www.mandalaybay.com

Still experimental, the era of driverless cars draws ever closer. And for many seasoned citizens, whose eyes, ears and reflexes are fading, it can’t happen soon enough.

Computer-driven cars are currently being tested in several states, so far all required to have human drivers aboard for emergency take-overs when necessary. California now allows Google, Mercedes and Volkswagen to test their driverless cars on its freeways and roads.

In the town of 500,000 citizens just 80 miles north of the capital city of Rio de Janeiro, there’s a strict law. It ... er... covers situations when people enter with horses and burros. The visiting critters are required to wear diapers.

We’ve known many human jackasses in politics, uniform and business, and full-time diapers would be appropriate for many of them.  Senior traveler: if horseback or burroback trails take you to that town, just be sure you ride in packin’ linen. www.pjf.mg.gov.br

The indoor pool, located above the terminal area at Qatar Airways' Al Mourjan Business Lounge, Hamad International Airport. Photo by wandering travel4seniors editor.