So... reasonably unless I am missing a trick (which is likely) you can get off the island at around level 3... Level 2 might be stretching it but I think it is doable.
And at most you can get off at level 8 if you absolutely do everything.
How the world is the next act going to work with that range? I mean I guess there could be an extra area and missions for people who take the faster route...
Or I also guess this could feature level scaling.