AKs vs. 3s2h2s board

[graarrg]

Button is 31/0/2.5, but only over 11 hands.

Holdem No Limit - $1 BB

Button ($119.75)
SB ($11.07)
BB ($103.25) [Hero]
UTG ($70.52)
CO ($96.50)

Hero is BB with Ks, As
Preflop: (5 players, $1.5)
UTG calls $1, CO folds, Button calls $1, SB calls $0.50, Hero raises $5, UTG folds, Button calls $5, SB folds

Flop: 3s, 2h, 2s (2 players, $14)
Hero bets $15, Button calls $15

Turn: 5c (2 players, $44)
Hero bets $16, Button calls $16

River: Kd (2 players, $76)
Hero bets $40, Button calls $40 and raises $42.75 and is All-In, Hero calls $26.25 and is All-In

I am pretty new to NL, so my bet amounts are not always optimal.

My intuition on the flop was that button was holding either suited connectors/broadways or pairs 22-99, possibly up to QQ if he was passive enough. Turn bet is a blocking bet/value bet vs. any broadways/weaker flush draws/44/freak straight draws. River is possibly a chip dump- I figured that this guy would be fishy enough to call me with any pp but check behind, so I put out a large bet.. maybe c/c is better?

Thanks, and hi2u NL100!