Particularly for the PS3 players, have a near empty journal, get as many of those quests done that you can do before venturing off to a new land. Otherwise if you have a lot of quests left unfinished, whatever the game is doing in the background might cause problems.
dont expect a lot from dragon riding, still try to have fun. everyone asked for it, and they gave it to us, even tho dragon riding was in vanilla game(you ride odahviing). dont be to critical. still a great dlc