I've just completed the game oblivion on xbox 360 and i don't know what to do next? can anyone help me?

i immediately di all the recommendation quests for the arcane university that's kept me busy for a while but now i just don't know what to do?ive done a few side quest but some are just gay and i don't want to do them.i watched some youtube video about like "bravil ocean catacombs or rooms" it looked really COOL but i don't know how to get there and i cant find the video again either. does anyone have any answers for me?please help!!