OLCC is nice!!! I stayed there in October 03. We were so busy w/ Disney (my first trip since 1982!) that we didn't get to do any of the activites of which there are a ton! On one of the TV channels, they show everything that's going on. Lots are free, but some have a fee). They ahve thier own mini golf (fee), tennis courts (fee), several real golf courses (fee). They have arts and crafts (usually free I think), pool activities, several theme/banquet nights at the clubhouse (fee), bingo, a free movie every day in the theater, a tropical beach pool party (think Jimmy Buffett style) on the weekends, and all kinds of other fun things.
At their lake, there's a sandy beach, volleyball court, and I believe you can rent either jet skis or little boats.
The resort is spread out (because it's huge!!) so you will get your exercise. They do have shuttle vans but it may be faster to drive yourself.
I am heading back to Orlando 5/22 and was hoping to get back to OL to do the stuff we missed, but I couldn't get in. Oh, well, hopefully they'll have some of the same fun stuff at Silver Lake up the street!