Plans have been announced for an extreme sports park and hotel on 130 acres just south of the Strip.

The $800 million complex called The Edge would offer dirt bike racing, wakeboarding, surfing, bungee jumping and indoor skydiving, among other activities, and include a 15-story, 640-room hotel.

This one sounds highly speculative, with no firm details on funding disclosed, but the developer says he wants to start construction this spring.

A similar project, minus the hotel, was proposed last year and is pending a few miles south near M Resort.

Question: What is the betting line on the time it will take to sing the national anthem at this year’s Super Bowl?

Answer: The national-­anthem proposition bet has become a Super Bowl fixture. This year’s line on the length of time it will take Luke Bryan to sing the anthem is 2:15. You can’t bet it at a Las Vegas sports book; it’s put up in offshore books only.

All-night buffet

The first all-night buffet in years has opened at the Palms. The Bistro’s graveyard buffet runs from 9 p.m. to 8 a.m. daily and is $10.99, or $8.99 if you show a players card.

It was instituted as a 24-hour alternative to the casino’s coffee shop, which is closed while undergoing a renovation.

Pricier dog

One of Las Vegas’ best hot dogs will cost you a little more, as the price of the wieners served from a cart in the Gold Coast sports book has gone up 50 cents. Regular dogs are now $2 and chili dogs are $3. They still come with kraut, onions and relish at no extra charge.

Gambling radio

A new sports and gambling-­information network is set to debut this week.

VSiN, the Vegas Stats & Information Network, will broadcast out of the South Point and feature sports-broadcasting legend Brent Musburger, boxing announcer Al Bernstein and several noted Las Vegas bookmakers. The show will be produced in a glass-enclosed studio near the South Point sports book and air on SiriusXM.