How far in advance do I need to reserve?

Although this is hard to judge, reservations should be made at least 2 days in advance or earlier. In the off-season (September and October), you should be ok to reserve 1 day before or on arrival. However, the season could be busier than expected and it is difficult to predict how long in advance you should book. Reservations are definitely recommended as soon as you know when you wish to come.