M.P.
There aren't any parks around here with all those things together that I know of. Big Spring Park downtown has a lake and ducks and is a great walking park, but does not have a playground. Kid's Space on Airport Road behind the Copeland's building is a great playground for any age. There are many other smaller parks with playgrounds depending on where you live. Also, Monte Sano State Park has great walking trails and a nice playground with picnic areas and such. Good luck!