I just played this hand, it was in a 18 player play money SNG..
but this was a hand against one of the better players, please give me some tips how to play it better or how to spot his hand?

PokerStars Game #5286817606: Tournament #26636685, 300+20 Hold'em No Limit - Level I (10/20) - 2006/06/18 - 00:37:12 (ET)
Table '26636685 2' 9-max Seat #8 is the button
Seat 1: kramnikul (1440 in chips)
Seat 2: jestam77 (2870 in chips)
Seat 3: Rienaldinho (3670 in chips)
Seat 4: DJ Syn (1140 in chips)
Seat 6: emme (1480 in chips)
Seat 8: klyderudy (1520 in chips)
Seat 9: BitterMe (1380 in chips)
BitterMe: posts small blind 10
kramnikul: posts big blind 20
*** HOLE CARDS ***
Dealt to Rienaldinho
jestam77: calls 20
Rienaldinho: raises 130 to 150
DJ Syn: calls 150
emme: calls 150
klyderudy: calls 150
BitterMe: folds
kramnikul: calls 130
jestam77: calls 130
*** FLOP ***
kramnikul: checks
jestam77: bets 200
Rienaldinho: calls 200
DJ Syn: folds
emme: folds
klyderudy: folds
kramnikul: folds
*** TURN ***
jestam77: checks
Rienaldinho: checks
*** RIVER ***
jestam77: bets 20
Rienaldinho: raises 280 to 300
jestam77: calls 280
*** SHOW DOWN ***
Rienaldinho: shows (a pair of Jacks)
jestam77: shows (three of a kind, Nines)
jestam77 collected 1910 from pot
*** SUMMARY ***
Total pot 1910 | Rake 0
Board
Seat 1: kramnikul (big blind) folded on the Flop
Seat 2: jestam77 showed and won (1910) with three of a kind, Nines
Seat 3: Rienaldinho showed and lost with a pair of Jacks
Seat 4: DJ Syn folded on the Flop
Seat 6: emme folded on the Flop
Seat 8: klyderudy (button) folded on the Flop
Seat 9: BitterMe (small blind) folded before Flop

Wrong forum. With that many players to the flop, I would be less likely to commit my chips in on a flop like that. If you think you had the best hand, protect your hand by betting more on flop and turn. Otherwise, dont raise later

Thanks for your advice!
And I'm sorry I posted this in the wrong forum

Fold pre-flop, AJ in early position is basically junk in a SNG. Barring that i'd prefer limping to raising. Barring that, raise the flop. Then, push the turn. Your river raise is good but you should've raised long long before then.