[400nl] Easy fold?

[Vammakala]

Party Poker No-Limit Hold'em, $4 BB (5 handed) Hand History converter Courtesy of PokerZion.com

Hero ($434.20)
Button ($484.80)
SB ($270.35)
BB ($262.30)
UTG ($239)

Preflop: Hero is MP with T[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $16</font>, <font color="#666666">2 folds</font>, BB calls $12.

Flop: ($34) 5[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $25</font>, BB calls $25.

Turn: ($84) A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, Hero checks.

River: ($84) J[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $60</font>, Hero ???

Villain is an unknown. He's been in the table for around 15 hands this far and he's been very active in terms of limping and calling, but also open raising some. He doesn't strike as a good player and his stack size also backs this up.

What arguments could be made for calling/folding here? Raising would be a bluff, but would it be a viable option in this spot? Any thoughts?