A couple plans to be in Edinburgh in early May; on our own, not in a tour group.
Does anyone have suggestions for visiting the Falkirk Wheel and the Kelpies?
https://www.visitscotland.com/info/see-do/the-helix-home-of-the-kelpies-p889261
Hopefully intel from these websites will help you decide how to visit.
wdlangrc, will you have a rental car? It's easy to get to both, which are near each other, with a car, but public transportation can also be used, although it takes a bit more maneuvering.
Will you be doing this as a day trip from Edinburgh or Glasgow? Or will you be heading there as part of a road trip to somewhere else. More information would be helpful.