comma before adverb [end position]: ...had a great time, nonetheless.

[wizard8451]

Is the comma preferred? But we had a great time, nonetheless.

 

[panjandrum]

Is the comma preferred? But we had a great time, nonetheless.

I think the comma is preferred, though perhaps not essential, because nonetheless is a kind of afterthought - an asided aside.
But I use commas more than others.

 

[vdawg]

I agree with panjandrum, but I would also point out that "but" and "nonetheless" are redundant in this context. While this would be ok in conversation, I would avoid writing both of them in the same sentence.