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

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

Our recent flight into Maui was a revelation. We’re familiar with LAX, SFO, JFK and even BOO, ACK and AWK. And refuse to list here the one for Fukuoka, Japan.

However, we just wondered why OGG identifies the Maui facility. Is it named for the Wizard of Ogg, or because the island is shaped like a giant ogg? Actually, the story is an inspiring one. It’s in honor of Jimmy Hogg, a local guy who rose from laborer in 1930 to skilled pilot of everything from biwings to jets. hawaii.gov/ogg

You don’t have to be an Alfred Hitchcock fan to visit this neat boutique hostelry near Nob Hill. It was called the Empire back in 1958, when some scenes from the thrilling film starring James Stewart (dangling from the roof) and Kim Novak were shot there.

The cheerfully-bright lobby colors welcome guests, along with orange and yellow themes in the pleasant guest rooms. To emphasize the theme, the iconic movie plays continuously in the hotel lobby.

Room rates are from about $240 per night. Now part of the Haiyi chain, Hotel Vertigo is located at 940 Sutter St., San Francisco CA 94109, close to the city’s top restaurants, cable car and upscale shopping. hotelvertigosf.com