If you’re bored i would definitely recommend changing your car radio! The sound improvement is amazing and being able to connect an iPod instead of fumbling around for cds while trying to keep the car in a straight line is definitely worth it.
Make sure everything is well grounded and that the signal cables are far away from the power cables or else you get a horrible whine coming from the alternator, especially if you put a sub in the boot.
If you’ve got a Honda Civic 7th Gen 2000-2004 then this guide should help, It definitely helped me. Just watch out for the yellow cables, they are for the airbags and are best left well alone 
(Oh.. and disconnect the negative battery lead, to be on the safe side)