Hee-Hawing it up with trips on Full Tilt ($5.50)

[RoyalLance]

I after studying this hand, I think I could have played this hand much better.

FullTiltPoker $5 + $0.50 Sit & Go ( - - No Limit Hold'em 20/40 Blinds
Seat 1: chrismo (2,760)
Seat 2: pigtender (1,722)
Seat 3: WetoddEd (1,635)
Seat 4: Giddy yup (1,035)
Seat 5: RoyalLance (1,545)
Seat 6: A K Shartenberg (1,715)
Seat 7: buddog08 (1,370)
Seat 8: reraizallin (1,718)
Giddy yup posts the small blind of 20
RoyalLance posts the big blind of 40
The button is in seat #3
*** HOLE CARDS ***
Dealt to RoyalLance [3c 5c]
Seat 6 folds
Seat 7 calls 40
Seat 8 folds
Seat 1 folds
Seat 2 folds
Seat 3 calls 40
Seat 4 calls 20
RoyalLance checks
*** FLOP *** [6h 5s 5d]
Seat 4 checks
RoyalLance checks
Seat 7 checks
Seat 3 checks
*** TURN *** [6h 5s 5d] [2c]
Seat 4 checks
RoyalLance bets 80
Seat 7 raises to 200
Seat 3 folds
Seat 4 folds
RoyalLance calls 120
*** RIVER *** [6h 5s 5d 2c] [8c]
RoyalLance bets 1,305, and is all in
Seat 7 calls 1,130, and is all in
Uncalled bet of 175 returned to RoyalLance

I was thinking I should have bet the flop to thin out the field instead of slowplaying, and I should have made a smaller value bet on the river. Any suggestions?