A great and easy way to get rid of M-COM stations isn't to plant charges as those can be defused but to physically destroy them. In Arica Harbor on the first base the best place to destroy station B is the tower to the right of the map midway between the attacking spawn place and the M-COMS.
For this to work you need to be using the Engineer class. Go up the ladder, to the top of the tower and take your rocket launcher out (the heat guided one, third one you unlock is the best for this) Aim at the wall right in front of the MCOM box send a missile to it, destroy it and keep launching rockets to the station until its destroyed. This process takes about 8 rockets so use the extra explosives spec or 2 lives. You can do this from anywhere on the map,on any base and of course on any map. Arica Harbor just happens to be one of the easier ones to do this on.You will know the rockets are hitting it if the orange sign above it flashes. You should be getting +50 pints every 2 missiles and the eventual +100 for destroying it.
You cant actually get out of any map in BFBC2 but you can get to places your not supposed to by doing so. There is a countdown when you go out the map that will kill you if you dont get back in before its reached over which gives you time to get out, around and back in again. There will often be walls or hills to stop you getting out but you can jump on rocks to get onto them. then the countdown will start, get close to the edge of the hill and it should go away even if your still on the hill because the line separating what area is in and what isn't, isn't very defined so if you stay on this line when you go to somewhere you normally cant, you won't die. E.g in Arica Harbor, second base when defending go to the left of the map (facing the enemy's base) one go to the rocks, jump up onto them and then onto the hill, then walk along until you reach the end of where you can go (because there is a cliff in front of you)and from there you can either stay there and have a good vantage point of the attackers coming under you or go left and up between the rock and the sand where you then have a good vantage point of the enemy base BUT you are also very exposed.
Get in a black hawk helicopter then switch to the position where you use your weapons then use the repair tool. Every time the black hawk gets hit you repair it and get a good amount of XP, just make sure the pilot knows what he's doing.
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