NL $25 (0.25/0.50)
The table is medium tight with an average 3-4 players in each game...

You have a late position

Dealt to you: [6s 7s]

Pre-flop:
3 guys limps in before you
You: Limp in $0.5
BB checks (Making you 5 players in this game, you have the last position)

Pot now: $2.75

Flop: [ 8s, As, Ts] (you have the flush, and gut shot for SF)

BB: checks
3 limpers: checks
You: bets $3
BB: calls $3
1 limper call $3, the rest of them fold.

Pot now: $11.75 (3 players in the pot)
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Your readings:
BB - A good tight player, large stack around $60, pretty aggressive.
The limper: Hard read on this player. Not very aggressive. Seems like a pretty average guy. $29 stack.
Your self: $21, not working so well today. You belive they think of you as a tight and pretty aggressive player.
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Turn:
Pot now: $11.75
[ 8s, As, Ts] [Ad]

BB: Bets $3
Limper: Calls $3
You: Raises to $6
BB: Call $3
Limper: Call $3

River:
Pot now: $29.75
[ 8s, As, Ts, Ad] [2d]

BB: Checks
Limper: Checks
You: ?????????????