Maybe IABU but I don't personally feel it's a great day our for 5-7 year olds. Each year the whole school goes on a trip and this year it's the National Gallery. Nursery and Reception are off to the zoo as the school feel that the national Gallery would be too boring for the younger ones.
I feel it's also a bit boring for year 1! Unless you like looking at art etc, it really isn't much of a fun day out IMO! It is really not DS's type of thing and after speaking to others in the playground, most of us feel our dc would prefer the zoo!
Aibu to think the school hasn't really considered that if a class of 5 year olds (R) would find it boring, maybe a class of (yr1) 5 year olds might too?!