Las Vegas is a town known for rockin’ and rollin’, but there was a bit too much of the former last week when the city was hit by a rare earthquake.

 The epicenter of the quake that registered magnitude 5.4 was approximately 150 miles northeast, near Caliente, but it was strong enough to shake the city and shut down several exit ramps on the freeway until they could be inspected and deemed stable. That was the extent of the problems, however, as other potentially vulnerable areas — the airport, monorail and High Roller observation wheel — all were undamaged.

Twofer burgers: On Tuesdays, hamburgers are two for the price of one at Hennessey’s downtown.

The basic burger is regularly $11, so it’s $5.50 for a pretty good-sized burger with all the toppings and fries.

Take away: MGM Grand has instituted a buffet-to-go option. Weekday prices are $12.99 for breakfast, $15.99 for lunch and $19.99 for dinner. Weekend prices are $17.99 for brunch and $26.99 for dinner. Add $5 for dessert. Take-out options are also available at the buffets at Mirage, Luxor and Cosmopolitan.

Dollar Marys: From 6 a.m. to noon daily, all bars at South Point serve Bloody Marys and mimosas for $1, and Baileys and coffee for $2. The Marys are made fresh and served with a couple of olives. It’s one of the best drinking deals in Vegas.

Summer displays: The new summer exhibit in Bellagio’s Conservatory and Botanical Gardens features an underwater theme, with coral reefs, jellyfish, air bubbles and a sunken-treasure chest.

Across the Strip, the Palazzo’s exhibit is a floral spectacular that celebrates Carnevale Di Venezia. Both exhibits are free.

QUESTION: Forget about casinos. How many drugstores are on the Strip?

ANSWER: Counting the new ones at Treasure Island (where the pirate show used to be) and the north Strip (where Holy Cow! used to be), there are nine. Six are Walgreens stores and three are CVS pharmacies.

Another CVS is reportedly in the works.

For more information about Las Vegas shows, buffets, coupons and good deals, go to www.LasVegasAdvisor.com.