M.M.
Have you looked at White Rock Lake in Dallas? If you're simply looking for an outdoor ceremony, I doubt Parks will charge you for getting married off the path. They charge for renting the buildings. There are parts where you can overlook the lake and see the skyline in the back. Have you thought of Las Colinas downtown area by the canal? I've seen so many pics done by my photographer down there and it appears real pretty. Good luck!