[quote=@Delta44]
<Snipped quote by Caitimus>

Don't say that! I'll try and make you have to improvise, otherwise! XD
[/quote]

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.