When I was a kid, and we were lucky enough to find berries, my Mom would make a sort of jam by cooking the berries with some sugar in a pot. Then she would make tea biscuits or scones in a cast iron frying pan over the fire, turning them once to brown on both sides. MMMMMMM, I can still taste the rasberry jam done that way.
You might also try this. Using fairly large, double thickness squares of foil, make a sort of cup shape, put in some berries, sugar and maybe a little juice or water (not much, as the berries will probably be juicy) then sprinkle dry cake mix over it, close the top tightly and place in the coals to cook for about 1/2 and hour. This should come out sort of like a cobbler. I know this sounds weird, but I've done it with applesauce and dry gingerbread cake mix and it works.
Some of the other things I like to do are: twisters- make up a thick tea biscuit dough, form it into long pieces (about 8 inches or so and about 1 inch in diameter) and then twist it around the end of a faily large stick. Cook over the coals until done. Slide it off the stick carefully, and then fill with butter and jam or whatever tickles your fancy. You can also do the same sort of thing by wrapping the dough around a hot dog (make sure the dog is completely covered or it will burn before the dough cooks) and voila! hot dogs in their own little buns.
Whatever you decide to make, it will be great, because everything tastes better in the great outdoors.