No solid reads on any opponent in the hand.

I had no idea how to play this hand whatsoever - I was OOP vs. multiple opponents with a mediocre hand on a monotone board so I just played calling station after my lead bet was called. Thoughts?

Party Poker No-Limit Hold'em, $ Hero (9 handed) from (Format: FlopTurnRiver)

saw flop|saw showdown

UTG ($43.36)
UTG+1 ($21.24)
MP1 ($22.27)
MP2 ($24.38)
MP3 ($29.91)
CO ($38.20)
Button ($24.50)
SB ($14.70)
Hero ($29.95)

Preflop: Hero is BB with J, 6. SB posts a blind of $0.10.
UTG calls $0.25, 1 fold, MP1 calls $0.25, MP2 calls $0.25, 4 folds, Hero checks.

Flop: ($1.10) 6, A, J (4 players)
Hero bets $1, UTG calls $1, MP1 calls $1, MP2 folds.

Turn: ($4.10) 9 (3 players)
Hero checks, UTG checks, MP1 bets $1.76, Hero calls $1.76, UTG calls $1.76.

River: ($9.38) 4 (3 players)
Hero checks, UTG checks, MP1 bets $2, Hero calls $2, UTG folds.

Final Pot: $13.38

I would lead the turn for pot.
Then check the river if it was a non-diamond and hope they bluff.

Since you checked the turn, you should check-raise to $12 and call a push.

I would have bet the turn strong as well. Why didn't you check-raise that rediculous bet? Why did you call? You needed to be more aggressive in this hand.