If you are in Grenada and would like to stay at Millennium Connection Guest house, there is a ferry service from Grenada to Petite Martinique on a daily basis called 'Osprey Lines Ltd'. Their service is as follows:
  
           
       
           
   
 

Osprey Lines Schedules ...

Departing Petite Martinique to Carriacou
Mon Tue Wed Thu Fri Sat Sun
- 5:30 AM 5:30 AM 5:30 AM 5:30 AM - -
3:00 PM 3:00 PM 3:00 PM 3:00 PM 3:00 PM 3:00 PM 3:00 PM
Price:
Adults - Return: EC$60/US$24 One Way: EC$30/US$12
Children [5 - 12] Return: EC$30/US$12 One way: EC$15/US$6
Children [under 5] Return: EC$10/US$4 One way: EC$5/US$2

Departing Carriacou to Petite Martinique
Mon Tue Wed Thu Fri Sat Sun
10:30 AM 10:30 AM 10:30 AM 10:30 AM 10:30 AM 10:30 AM 9:30 AM
7:00 PM 7:00 PM 7:00 PM 7:00 PM - - -

Departing Carriacou to Grenada
Mon Tue Wed Thu Fri Sat Sun
6:00 AM 6:00 AM 6:00 AM 6:00 AM 6:00 AM 6:00 AM -
3:30 PM 3:30 PM 3:30 PM 3:30 PM 3:30 PM 3:30 PM 3:30 PM
Price:
Adults - Return: EC$160/US$62 One Way: EC$80/US$31
Children [5 - 12] Return: EC$100/US$38 One way: EC$50/US$19
Children [under 5] Return: EC$20/US$8 One way: EC$10/US$4

Departing Grenada to Carriacou
Mon Tue Wed Thu Fri Sat Sun
9:00 AM 9:00 AM 9:00 AM 9:00 AM 9:00 AM 9:00 AM 8:00 AM
5:30 PM 5:30 PM 5:30 PM 5:30 PM 5:30 PM - 5:30 PM