at there respective resort there's typically a pool & swimming area and a playground. try the boardwalk resort with it's great vibe, there's the espn club, danceclubs & bars (there's a cover fee though) just walking the boardwalk w/ the lights at night is romantic & free. try downtown disney marketplace & westside, there's the
lego playzone-dtd m free to play, tons of stores, planet hollywood-dtd ws has memrobilia to view free, tons of stores, dance and comedy clubs(although clubs have a fee) at the grand floridian & polynesian resorts there's the nightly water pagaent on bay lake free from any vantage point. at the animal kingdom lodge there's roaming giraffe, zebra and gazelle's free from any vantage point and daily storytellings.
for acouple of bucks there's the petting zoo at ft. wilderness, you can rent a boat for 1/2 hour at dtw and most resorts. there's also arcades at all the wdw resorts for acouple of quarters the kids can have fun.
obviously with a park ticket all the rides and attractions within that park are included. free in the parks are meet & greets w/ mickey & friends where you can get autograph/picture (cost of pen, paper & your camera development) and epcot funstops for kids.