Option 1, the big goal being to join the rebellion and overthrow the King. Now I will strongly encourage players to engage their characters in other subplots whether it's romance or finding their long lost parents. Should the players get too far off course I would jump in with a post that would get them back on course. A good story doesn't have just one plot but a plethora of smaller plots creating a cohesive whole. Eventually players might find their characters having to choose between the goals of the rebellion and their personal goals.