The Time Warp River Cruise Company​, on Jervis Bay, New South Wales, Australia.
www.wooden-boat-charter-australia.com.au​​​

There will always be a Time Warp skipper on board. Entirely at the discretion of the skipper, any other persons on board may be allocated crew duties, such as navigator, helm operator, engineer, deck hand, cook, steward and so on.

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Neither the skipper or any crew, are paid for their participation.

 

If you see the situation as a group of friends out for a day on the water, you've got the right idea!