Depending on your mileage_I would go ahead and invest on the factory type tranny service. There are 2 versions. The first is about $50 and all they do is drain out 3 quarts and refill. If the car is more than 3 years old or has more than 30,000 on the odometer consider doing the full service (forget the owner's manual on this one) which will set you back $100-BUT-gets you a complete flush and fill of 7 quarts. The key is FLUSH using a machine that is designed to reverse flush the transmission. Honda dealers are supposed to do it this way in order to clean the screen in the gearbox. There is no replaceable filter like on certain domestic cars-so this is the way it HAS to be done.
That should help improve the response of the gearbox and extend its life. We do the fill version of the service after every track day and will do the full one at 30K.
As to changing any other fluids in the car-they have nothing to do with the transmission. I will strongly suggest that you cahange motor oil every 5K maximum and 3K minimum. Another thing-check with your dealer as many people fail to flush and fill the cooling system and brakes (clutch cylinders too) every 3 years or 30k-this is also important