... Accommodation for school participants are either (a) in a three-person shared room on-site at Arecibo Observatory or (b) in local hotels. There are approximately 11 shared rooms available on-site at a cost of $25.00 (+7% tax) per person per night. ... Unless you specifically requested otherwise, all participants have been assigned shared rooms by the organisers, either on-site or in a hotel. Any participants not willing to share rooms has been assigned a room in a hotel. ...