Jimmy Buffett is mixing business with pleasure on his latest trip to Honolulu.

While he's playing concerts on Maui and O'ahu, he's also here to help promote his newest restaurant.

Jimmy Buffett's at the Beachcomber opened earlier this month, and last night Buffett surprised patrons with an impromptu concert to christen the joint.

And it is some joint.

Located in the Ohana Waikiki Beachcomber Hotel (2300 Kalakaua Ave.), it's an over-the-top Parrothead paradise. It cost $15 million to build, is 22,000-square-feet big and can seat 400 patrons.

But you ain't seen nothin' yet.

The restaurant takes up the spot where the late Don Ho used to play at the Blue Hawaii showroom and also where the former Hibiscus Cafe restaurant sat. It's an area large enough for Buffett's surf museum and its walls are molded to look like lava rock. When you enter, you'll see fake lava oozing from the ceiling, tables laminated with island scenes and booths with different themes, like waves breaking overhead.

Live music and bars are inside the restaurant.

Margaritas will be served. Spongecake, we're not sure about yet.