First things first... FLUSH YOUR COOLANT ASAP. You need to fill her up with Genuine Honda Coolant. It has crap in there made for our cars just like the power steering fluid. Everyones been telling me this.

Second. Don't fill up the reservoir all the way. It acts as a catch basin for the coolant that expands in the radiator (like all hot things do). It needs to go somewhere, so it ends up in the reservoir.