$6 NLTRN: Two frustrating folds

[Somekid]

The first one was early in the tournament, so nothing too specific in terms of a read, but my opponent seemed a bit on the aggressive side of average (but definitely not a maniac). Should I just check the river? My plan on the river was to bet/fold and hope to get a little more value.

PokerStars No-Limit Hold'em Tourney, Big Blind is t20 (2 handed)

Hero (t1430)
BB (t1570)

Preflop: Hero is Button with Q[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/club.gif[/img].
<font color="#CC3333">Hero raises to t60</font>, BB calls t40.

Flop: (t120) 5[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets t85</font>, BB calls t85.

Turn: (t290) Q[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets t160</font>, BB calls t160.

River: (t610) A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets t300</font>, <font color="#CC3333">BB raises to t1265</font>, Hero folds.

Final Pot: t1210

In the hand below (against someone else), my opponent was aggressive, but not a maniac. Was my play okay?

PokerStars No-Limit Hold'em Tourney, Big Blind is t100 (2 handed)

Hero (t1555)
BB (t1445)

Preflop: Hero is Button with Q[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/diamond.gif[/img].
<font color="#CC3333">Hero raises to t200</font>, BB calls t100.

Flop: (t400) J[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets t275</font>, <font color="#CC3333">BB raises to t1245</font>, Hero folds.

Final Pot: t950