[Closed] $1 STT Trip aces, river decision

Hand converted with online PokerStrategy.com hand converter:

Play hand

$60/$120 No-Limit Hold'em (8 handed)

Known players:
[tg]MP1$1005.00:///////;MP2$1665.00:///////;MP3$965.00:///////;CO$1985.00:///////;BU$1370.00:///////;SB$1435.00:///////;BB (Hero)$2450.00:///////;UTG2$2625.00:///////;[/tg]

Preflop: Hero is BB with 2:c, A:c.
3 folds, MP3 calls $120.00, CO calls $120.00, 2 folds, Hero checks.

Flop: ($420) 3:h, 4:h, A:h (3 players)
Hero bets $120.00, MP3 folds, CO calls $120.00.

Turn: ($660) A:d (2 players)
Hero bets $480.00, CO calls $480.00.

River: ($1620) 3:c (2 players)
Hero checks, CO raises to $1,265.00(All-In)

I really didn't know what to do here?
How was my play up to this point?