Shooting docks can be productive year round. Spring, fall and winter prove to be the better months on the water I fish. Marinas are a great place to find crappie as well. As far as docks, look for ones that have lights shining onto the water, those are docks people fish from and have done things to make the fish want to be there. Docks close to deeper water are also a good draw. The fish don't care what a dock looks like. I used to shoot one that other's would avoid. It was pretty ramshackled and falling apart in places. Spider webs so thick your jig would get stuck and dangle above the water. Once I got the webs shot out it was loaded with post spawn fish. Nice, shady, and quiet. Best of luck to you.
The love for fishing is one of the best gifts you can pass along