Trying to find a film that's about a boy that gets kindnapped in a big park that's got lots of things going on.
The kidnappers keep the boy in a house, tied up on a bed. The kidnappers call the family asking for money.
That's all I can remember

Possibly Ransom (http://www.imdb.com/title/tt0117438/)

Definitely RANSOM - With Mel Gibson and Rene Russo

Yes, it's Ransom. http://www.imdb.com/title/tt0117438/

I have that movie, I get that movie from YouTube and I have all the episodes, sorry my bad english :D