Your flowers should contrast your dress a bit so the "reds" don't clash too much. Being married outside near a river I would go with more earthy hues to accentuate the beautiful surroundings. Deep reds and oranges, mossy greens. OR go with a fun feel with red, hot pink and orange
http://glamourousgowns.wordpress.com/2007/10/01/tropical-wedding-theme-red-orange-and-hot-pink-wedding-colours/
http://glamourousgowns.wordpress.com/2007/08/13/deep-red-or-burgundy-for-warmth-at-your-wedding/
http://www.blossomandbasketboutique.com/wedds0904040022a.jpg
http://yurikofloral.com/db1/00066/yurikofloral.com/_uimages/GenerationPhotography_12.jpg
http://yurikofloral.com/db1/00066/yurikofloral.com/_uimages/320_1__193.jpg
for your flowers: http://yurikofloral.com/db1/00066/yurikofloral.com/_uimages/darek_and_nissa_577__Medium_.jpg
I admire your spunk and boldness to go with a red dress!!
best wishes...............................