No parent wants to hear, "Are we there yet?" repeatedly. Yet making sure the kids are entertained can be easier said than done. Look for items such as a rear-seat entertainment system and MP3 players or adapters either as options or aftermarket accessories. Many cars now offer multiple headphone jacks and have systems that allow multiple entertainment options, such as the stereo and DVD player to be operated simultaneously, which is helpful if you need to suit different tastes.