Sense of humor, check, thanks for that laugh!
Just ahead of you on this exact transition...found some good advice in here: 2 y/o birthday on the river
Our key toys for the ramp/boat/camp (4&7yo): The big tube squirt guns (currently $10 for 2 at Costco), fishing rods without hooks- we just put floating lures on some $10 Target rods, and nets (these are awesome and still going after 2 years Melissa & Doug Happy Giddy Bug Net
The thing we didn't think of was guides for the class 2 rivers. Also: shade and maybe a bug tent, cheap foam pads for the kids, which also work well on decking or as a picnic "blanket" for lunch.
Random advice I learned from others: Carry 4x the snacks you think you need. Let any kid who can reach row and at least help with dishes if not tent set uo.