Marc Benioff keeps one of these $40,000 amphibious vehicles at his house in Hawaii

Salesforce CEO Marc Benioff loves all things Hawaii.

He wears Hawaiian shirts to work and even named his dog "Koa," a word that means "daring warrior" in the native tongue. 

He also owns a 5-acre estate on the Big Island, which he purchased for $12.5 million in 2000 and constructed over several years. 

He said at a 2012 conference that he spends about a third of his total time at his vacation home. 

And one of the things he likes to do while he's there is ride a Gibbs Quadski XL, an all-terrain vehicle that can instantly transform into a watercraft.  

The Quadski XL is quite the billionaire toy -it can travel up to 45 miles per hour on both water and land and they typically cost about $50,000 each. 

Benioff recently gave two Quadskis to the San Francisco Police and Fire Departments as a gift, apparently because he thought they would be helpful for water rescues. 

When deciding whether they would accept the gift, the Board of Supervisors valued the amphibious vehicles at $50,550 each.

After a bit of deliberation, the board ended up accepting the gift for use by emergency personnel. The SFPD even took one of the Quadskis out for a spin last weekend.

 Check out this video to see the Quadski in action.