Hiya,
Grenada has some good diving! Almost all diving is done from boats. Night diving somtimes from shore, but usually require a minimum amount of people for the dive. You can get everything from Wrecks - Bianca C' (18'000ton 600ft Cruisliner, 90-130ft), M/V Shakem (Sank under a year ago, 250ft cargo, 100ft max, nice wreck/reef dive), other include the Bucaneer, Twin Wrecks and Quarter Wreck.
Reefs - Deep to shallow, like the wrecks, fast drift, to slow dives. Shark reef - basking nurse sharks. Virgin diving up the north end - Isle de Rhonde, a day trip with 1-2 tanks incl. lunch.
Sister isle of Carriacou has 3 dive operations, mainly reef diving with trips to Isle de Rhonde as well (close than the Grenada dive operators). There are about 10 operators in all offering a range of services and prices. Usually from about 35Us/dive and 45 or more w/ equipment. Bianca C', for some reason is more, but not much a difference. Isle de Rhonde, a must do if you can, usually about 90-120/us for the whole trip - here a minimum of people is needed.
No chamber on the island. Nearest one is in Barbados, emergency protocols exist using low-altitude flights to the military operated chamber. This fact is pointed out in the release forms.
I will recommend ,
http://www.aquanautsgrenada.com/ as i have my best friend who works/teaches there (bias), they do a real nice service, have nice rental stuff and have nice dive boat. The also do liveaboard to the Grenadines (Islands between the north of Grenada and south of St.Vincent).
During your SI's, go do some tours, sightseeing of historical forts and buildings. Outdoor type? Do some hiking, ranges from easy hiking to heavy duty stuff. Recommend - Seven Sister Waterfalls, Mt.Qua Qua, Concord Falls, and Mt.St.Catherine - Grenada's highest peak. Check my site out at -
http://www.geocities.com/hiking_grenada/
Warning - Hiking after Diving! I've known one person to get a slight touch of the bends after doing a deep dive and having a nice hike!
Loads of beaches, places to see and things to do.
Hope that helps!
Hope you come see this island paradise
