this is exactly right. when i took piano lessons as a child my parents would chide me if i tried to learn music that interested me (blues, pops, rock). they would literally prevent me from learning what i wanted, which would just manifest in resentment and reluctance in learning what they wanted me to learn (basically nothing but classical). lose-lose.
good intentions, shockingly terrible execution. i still give them grief for that today, and they admit it was ill-conceived. it's a great example of smart people doing stupid, stupid things.
and as far as museums go, perhaps it isn't a great idea to spend 4 hours straight in a single place walking in circles with a young child. the next time you want to go to a museum, what are they going to remember? the beautiful art, or the forced march?
it's all these little things are what build resentment in children, not the big ideas. it's sabotaging your own good intentions. maybe i just don't know anything about parenting (i have no kids myself) but it just seems patently obvious to me that you shouldn't ruin good things like this by projecting adult-levels of discipline on little kids!