Look up at the windows above all the shops on Main Street. There are tributes to many of the original imagineers of WDW in the names of the proprietors. Have a seat at the end of the side street off to the right, with a cool drink or coffee or ice cream, and watch everyone pass along Main Street.
In Liberty Square, look at the plaques and flags round the Liberty Bell. Check out the shutters on the houses. Look for the changes in the paths and sidewalks from Frontierland, Adventureland and Liberty Square. You can see the demarcation between the lands.
In Adventureland, listen for recordings from the balconies. Look for hidden animal carvings in the rocks. Check how different the building is on Adventureland and Frontierland sides, the profile looks totally different, even though you can’t workout how they did that!
Linger around the wishing well. Check out the fountain behind the castle. Go all the way round on the steam trains, or ride each one of the steam trains running. How many animals can you see on the sides of the railway between Town Square and beyond Frontierland? Try and catch the sidewalk “painters” in Fantasyland.
I love all this this stuff, take some time to check out something new.