<Snipped quote by Caitimus>
Don't say that! I'll try and make you have to improvise, otherwise! XD
I'm very good at improvising so come at me bro! All kidding aside, take the RP wherever you guys want. As a DM I have tricks up my sleeve to force the party back together if necessary and if the group isn't doing it on it's own. There are a ton of side quests to explore, at least 3 in every city (bonus xp for being a completionist and completing all side quests in a city/area). It would be natural in real life to split up but it's entirely up to the players if they want to do so or want to stick together.