K.W.
Oh there are some great playgrounds around here!
Here's a link to Orange County's site that lists all of their parks (but the City of Winter Park and Orlando have some good ones too)
http://www.orangecountyfl.net/dept/cesrvcs/parks/?REDID={...
A really good one for the older kids is in Winter Park called Lake Island park (but people refer to it as Castle park). It has a huge structure to climb on and play.
http://www.cityofwinterpark.org/2005/depts/parks/lakeisla...
There are also some free/inexpensive splash parks in Orlando, which are worth the drive. Downey Park has a really nice one (which is East off of Dean road) and there is a new one called Dr. Phillips Park which is awesome. It's out off of Sand Lake. Both are only a dollar or two to get in and are well worth the drive/cost! (Considering how much people pay to get into the water parks around here)
Hope that helps!