There is no area in the game to avoid getting banned for macroing. The only smart ideas to help reduce getting banned is to play on Quick Chat worlds as mentioned above, or do the complete opposite of what everyone is suggesting and firemake in a highly populated area such as the Grand Exchange.
Noone will think to bot in a populated area to begin with, this is the direct opposite of what your mind would suggest. It'd tell you to avoid high areas of players to avoid getting banned.
Be sure to wear actual gear, such as robes, or a skillcape, no combat equipment.