Do basically the same thing as in the "Capture The Flag: Easy points" hint, and put a land mine on the base of the flag/marker thing that shows whose base it is. Then, move on and do this to every base you find. You will not only get points every time you capture a base, but also for every time someone tries to take one from your team. They will get blown up, giving you more points. Then go back after awhile and repeat.