Is the Island of Curacao in the caribbean protected from a tsunami and
if not, how large of a tsunami could hit the island,based on its
location.

According to the CIA World Factbook:
Curacao and Bonaire are south of Caribbean hurricane belt and are
rarely threatened; Sint Maarten, Saba, and Sint Eustatius are subject
to hurricanes from July to October

The elevations range between:
lowest point: Caribbean Sea 0 m 
highest point: Mount Scenery 862 m 

According to the USGS website:
http://earthquake.usgs.gov/eqinthenews/2004/usslav/canit.html

Puerto Rico and the U.S. Virgin Islands are more susceptible than
other locations in the eastern U.S., because of a subduction zone that
lies beneath the Caribbean Sea, capable of generating large
earthquakes. Tsunamis have impacted Puerto Rico and the Virgin Islands
more than 6 times in recorded history. The web site of the Puerto Rico
Tsunami Warning and Mitigation Program also asks whether a tsunami
similar to the one in the Indian Ocean could hit the Caribbean region.
An event in 1867 off the Virgin Islands is thought to have generated
waves 12 meters high. The tsunami with the greatest amount of damage
in Puerto Rico was in 1918 from an earthquake off the Mona Passage.
With a maximum runup of 6 meters, the tsunami itself killed 40 people
with an additional 76 people killed by the earthquake. The Caribbean
region as a whole has a history of other earthquakes that have caused
damaging tsunamis.

And the history of tsunami's in the Carribean region is told @:
http://isis.uwimona.edu.jm/uds/Tsunami_Lander.html

From all references, a 9.0 could soak the entire region fairly easily
tho it's safe to say there are high points that people can climb to
should one actually surface.