I have heard the 2nd island North of the dunedin causeway is an awesome island, but since we can't fit under the drawbridge, we never sail /camp there
The big island just south of the dunedin causeway is a great island, park on the south or south west side.
The 4th island south is also a good island for parking/camping but is very small so can be a bit overcrowded and bathroom use can be tricky with all the people coming and going off that island (it is across from the dunedin marina)
The 8th island south (just north of the seminal boat ramp) is also a perfect island for camping. You can find more info on camping
https://travelsites.com/camping/