Dr. David J. Wagner has a new juried exhibition that would be of interest to landscape painters. This includes paintings of ANY parks.....national, state, provincial, county or city park in the U.S., Canada or Mexico. There are substantial awards in Dr. Wagner's traveling museum shows. The deadline is October, 2012, and the exhibition starts in 2013 so you have plenty of time.

Dr. Wagner has impeccable credentials and has been involved in the formation of many successful touring exhibitions such as "Birds in Art" and the original "Arts for the Parks" and is the tour director for the Society of Animal Artists among others.
Here's a link to his website where you can download the entry:
davidjwagnerllc.com/competitions.html