For visiting an era I never saw, though technically not a proper season, I would love to go back to 1874 and to hang around on Heathfield Rd and keep an eye out for a few fellows from a cricket club having a chat about a winter sport. I would give a lot to join in those discussions.
For a season that delivered the only title in the past century I would have to go back to 1980-81. Such a good season produced many a happy Saturday night and it all came right in the end. For pure fun, and exploring the new joys of watching exhilarating football and boisterous crowds in the top flight then 1976-77 would be my choice.