If the Hotel Shuttle is not running at that time, there are also official airport taxis that can be hired at the exit from baggage claim. They have a window inside at the end of the rental car counters and also just outside before getting to the waiting masses. At 10:00 pm a couple of flights might be arriving at the same time. These taxis are newer and they also have several minivans for larger groups. I would expect your group of 5 to cost about $30 to the Corobici. Avoid changing $ in the airport money exchange window, as the rate is very bad. The taxi window takes dollars and your hotel and every bank will give you a better exchange.