Isn't Stoke Poges, where Gray was inspired to write his Elegy, near Windsor?

Stoke Poges is about 4 miles north of Windsor - about 1.5 miles from the Slough train station (on mainline to Paddington) so could take train there from Windsor then walk or bus - no doubt buses from Windsor. Assume the churchyard is in the village.

You could take a little boat trip down the Thames as well.

Two good pubs in Old Windsor are the Bells of Ouzeley and the Union Inn. I agree about Eton College, as my great-uncle was a vicar for the school back in the 50's. Because of family connections, I have had private tours of the college. I don't know if that can be arranged for ordinary tourists.

My Aunt Pat and Uncle Terry live in Old Windsor. Cheers.