First of all, I'd read the MAIB report on Celtic Pioneer http://www.maib.gov.uk/publications/...ic_pioneer.cfm
Make sure your insurance and your coding covers this activity as well as your training work.
I'd be having a long talk with the commissioning clients about what they're trying to achieve. If it's part of a reward programme and it's just for fun, that's quite a simple programme to run and your RYA experience will be useful - but it will still be influenced by where you're working and the sea conditions on the day of course.
Most of the corporate work we do isn't as simple as that: with budgets squeezed there has to be a commercial benefit, and we have built events with specific objectives designed to develop teambuilding, leadership, problem-solving, communication skills, and relationship-management with clients. These sort of events do take a lot more thought and planning but they do work pretty well. Feel free to PM me if you want to discuss any thoughts