WILLLIAMSBURG, Mich. — Step inside the newly rebuilt Turtle Creek Casino & Hotel, and you'll find the typical blackjack tables, slot machines and loosen-your-belt buffet. But your eyes — and nose — may detect unusual features.

During the daytime, half the casino's lighting comes from skylights. Drinks are served only in glasses: no cans or bottles. Some gamblers are smoking, but the air isn't thick with smoke. And, outside, the roof of Bourbons 72 restaurant sports day lilies, ferns and leafy hostas.

Turtle Creek, near Traverse City, bills itself as a "green" casino, designed to make the lightest possible footprint on the landscape without sacrificing profitability. Its owners, the Grand Traverse Band of Ottawa and Chippewa Indians, are among a growing number of casino builders and operators interested in environmental stewardship.

Even in an industry closely identified with devil-may-care gluttony, going green makes business sense as consumers increasingly demand sustainable products and services, said Stephen Knowles, principal designer for Turtle Creek. His Minneapolis-based firm has worked with a number of tribes on casino projects with eco-friendly aspects.

The trend is reaching even casinos in Las Vegas, long criticized by environmentalists for its extravagant use of natural resources.

In April, the Palazzo Las Vegas resort became the world's largest building project to receive a Leadership in Energy and Environmental Design, or LEED, certificate from the U.S. Green Building Council. CityCenter, a resort complex under construction in Las Vegas, is among at least 10 casino-related projects nationwide seeking certification.

The council has an extensive rating system for building design, construction and operation. No casinos have been certified thus far; the Palazzo's LEED certificate was just for its hotel.

Tax incentives and the prospect of lower electric bills were big motives, said Gordon Absher, spokesman for MGM Mirage, which is developing and co-owns CityCenter. "And from a social perspective, it's the right thing to do."

The 360,000-square-foot, $116 million Turtle Creek opened Tuesday and replaces a smaller casino that will be torn down and mostly recycled.

"As native people, we feel an obligation to protect Mother Earth in everything that we do," said Robert Kewaygoshkum, chairman of the nearly 4,000-member Grand Traverse Band.

Going green boosted the price of developing Turtle Creek about 10 percent, but tribal leaders expect to save money in the long run.

"The sustainability mindset is affecting all kinds of choices, including what places you want to visit for entertainment," said designer Knowles.

For instance, in nearby Petoskey, when the Little Traverse Bay Bands of Odawa Indians opened a casino resort a year ago in previously open farmland, it planted prairie grass and native tree species and preserved wildlife habitat on the property, tribal chairman Frank Ettawageshik said. The long-range plan is to power the resort at least partly with wind or solar energy.

Casinos typically face a big obstacle to LEED certification: the need to satisfy customers who smoke. LEED requires separate smoking areas and systems to contain and remove smoke and monitor air quality, said Ashley Katz, spokeswoman for the green building council.

Absher said those requirements make the casino the only section of the 76-acre, mixed-use CityCenter project that MGM doesn't expect will qualify for LEED certification, despite the casino's other sustainable features.

"We will meet all the other standards," he said. "But we cannot overcome this. Smoking is something that is very important to our customer base at this point."

It's especially hard to limit tobacco use in a tribal casino, given its iconic status in American Indian culture. But Turtle Creek developers tried to do the next best thing by installing a purifying system.

Outdoor air is pumped continuously into the gambling area through vents in the raised floor. Smoky air rises to the ceiling and is piped through filters, cleansed and sent back outside.

"When you're standing next to someone who is smoking, you'll smell it a bit," said Steven Feringa, tribal architect. "But the majority of the smoke is going to shoot up and away from you."