Looking for some suggestions on places to rent a house on the water

Planning a trip for the beginning of August and we would like to rent a house on the water for about 5 days. I have been looking heavily at Bay St. Louis because I like the layout and the houses are affordable. We found 2 houses we really liked but they did not have the "book it now" feature (I have been using VRBO)and the owners have not been very responsive to phone calls or emails, its weird its like they don't want to rent out. The rest of the houses seemed to be tucked away on the small canals. I was wondering if anyone could suggest places similar to Bay St. Louis, also need a dock/pier to keep my bay boat tied up. Trip is for 8-10 people.

Also, would there be more places in Bay St. Louis for rent if I were to call a realtor? I have even considered driving there for the day and driving around to see if I could find any for rent.