Unsure about this fold

[nihil]

Party Poker 0.50/1 Hold'em (9 handed)

Preflop: Hero is UTG+1 with Q[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/spade.gif[/img].
UTG folds, Hero raises, MP1 calls, MP2 folds, MP3 folds, CO calls, Button folds, SB folds, BB calls.

Flop: (8.50 SB) 8[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/club.gif[/img] <font color="blue">(4 players)</font>
BB checks, Hero bets, MP1 calls, CO calls, BB folds.

Turn: (5.75 BB) 2[img]/images/graemlins/heart.gif[/img] <font color="blue">(3 players)</font>
Hero bets, MP1 calls, CO calls.

River: (8.75 BB) A[img]/images/graemlins/heart.gif[/img] <font color="blue">(3 players)</font>
Hero checks, MP1 checks, CO bets, Hero folds, MP1 folds.

Final Pot: 9.75 BB

At the time it didn't feel right to not make that last call on the River (when in doubt I typically toss the hand away), but seeing the stuff people play I wouldn't have been surprised with someone hanging onto garbage with an Ace. Looking back on it I feel better about my fold on the River. Was folding indeed the correct thing to do?