Hi! I was in kosovo for one year in 2005, peacekeeping... Kosovo is quite safe now a days, criminality is quite high but if you act normally and dont plan to mess with bad guys, you gonna be fine...what comes to Serbian-Kosovon border, it is probably closed so use some else to get in..
There is quite a lot to see, monasterys with wine sales, historical places and war sites...
Go in peace and enjoy your ride!!