Just drop something volatile (TNT, RDX) next to whatever you're going to blow up. put one explosive per tile with no gaps. I typically put whatever I'm going to trigger (usually a proper, non voltaile explosive like C1 or C4 with a remote detonator) in ht emiddle, then a bundle of TNT on each side, carrying on till I have enough planted. They really don't like exploding if something next t them doesn't explode, though. When i did the above I was in San Mona and had dropped like 20 odd bundles of TNT on the ground. It was awesome.Suffice it to say, Kingpin (or most of his guards for that matter) didn't make it out alive.