Here is a fun thing to do if you have just started playing Civ 3 (or hell, whenever).
Get an ROP with your biggest foe. Whether it be the most technologically advanced, biggest military, the one with some nice wonders, or just jerkoff whos been bugging you all game, it does not really matter. Then, park about 10 units next to all their cities (less on the borders). Declare war, and watch them go *poof* in one turn.