Boat Trips- Advice Please!

Hello, 

I wonder if anyone can give me advice about putting on a boat trip, along a river that would be suitable for mainly children (but also adults) with Autism. Following feedback we have already had, we are avoiding loud noises (such as the commentary and traffic) and having lots of sensory expereinces on the boat i.e. soft blankets, feathers. Also limiting numbers so the trip doesn't feel crowded and ensuring passengers can get off the boat at spots along the trip, rather than feeling 'trapped' until the end. The trips are expected to last 40mins.

I'd be very grateful for any advice!