No worries Bravilor It's just an illustration.
One simple method might be:
assumung that the topography is a component already>
make a simple rectangular plane somewhere flat anywhere where it will not be ontop of existing geometry.
double click that plane and make it a group
now copy that group and position it over the top of a sand trap do this in top view with perspective off.
now edit the group so that it is larger than the sand trap
now position and rotate etc. the plane until it is just underneath the grass surface for the entire area of the trap.
now edit the group and select all and intersect with model.
now erase the outside unwanted stuff
now paint the plane the sand color.
bingo you have a new sand trap bottom that is not as deep as the original one and its been trimed to fit the hole.
now you can edit the new "bottom" an offset it and extrude it and contour it etc as much as you want since it's a seperate component it will not interfere with your existing topography.
at some point you can merge the two together if desired.
again just a suggestion. I'm sure there are other ways to sculpt the existing traps to be more shallow at the perimeter but by the looks of it you are quite capable modeler so I assume that if you wanted to you could do anything you put your mind to.
