----          ----------- 
--.>--------   |.........|
|.@........|   |.........|
|.A-----P-.|   |.........|
|..|...|.R.|   |....<....| 
|.B.D....S--   |.........| 
|.C..E..|..|   |.........| 
|.---FG.--.|   |.........| 
|..H...K.|.--  |.........| 
|.---J-..L.^------------+| 
|...|..M-.^^^^^^^^^^^^^^.| 
|..N......---------------- 
-----..|..|                
    -------               

P down 2x, R west 1x
H east 3x, J south 2x, north 1x, N west 1x
S north 1x, P west 2x
K south 1x, L east 1x, south 1x, fill pit
N east 7x, north 2x, east 1x, south 1x, east 1x, fill pit
J south 1x, east 4x, north 2x, east 1x, south 1x, east 2x, fill pit
R south 1x, S west 1x
A north 1x, C east 1x, B north 1x, D east 1x, C west 1x, E east 1x
F south 4x, west 3x, D south 6x, P west 2x, R west 2x

it should look like this now:

 ┌──┐          ┌─────────┐
┌┘·>└──────┐   │·········│
│·A········│   │·········│
│··┌───┐·─·│   │·········│
│·B│···│S··│   │····<····│
│···P·R@··─┤   │·········│
│·C···E·│··│   │·········│
│·───·G·└┐·│   │·········│
│·····H··│·└┐  │·········│
│·──┐·─K···^└──┴────────+┤
│···│··M─····^^^^^^^^^^^·│
│·F··D····┌──────────────┘
└───┐··│··│               
    └──┴──┘               

Filling the remaining pits should be trivial now. I'd recommend doing D, then F, R, E, G, H, P, C, B, S and finally A.