How to play 88?

[4_2_it]

My table image was actually a LAG, I was catching good starting hands, but getting no flop improvement. My stats after 40 hands are 42/12/3. No reads on villain, but he has done noting out of line.

PokerStars No-Limit Hold'em, $2 BB (5 handed) internettexasholdem.com

Hero ($228.25)
MP ($94.95)
Button ($312.70)
SB (villain)/ ($78.25)
BB ($248.25)

Preflop: Hero is UTG with 8[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/spade.gif[/img].
Hero calls $2, <font color="#666666">2 folds</font>, <font color="#CC3333">SB (villain)/ raises to $10</font>, <font color="#666666">1 fold</font>, Hero calls $8.

Flop: ($22) 6[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
villain checks, Hero checks.

Turn: ($22) 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">villain bets $4</font>, <font color="#CC3333">Hero raises to $12</font>, villain calls $8.

River: ($46) 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">villain bets $4</font>, <font color="#CC3333">Hero raises to $25</font>, <font color="#CC3333">villain raises to $56.25</font>, Hero ????

Am I good here? What do you make of the donk bet followed by the reraise? Critique on all streets encouraged.