Poker Room
Limit: $3/$6
9 players

I've only been at the table for 10 minutes or so, and have no reads.

Pre-flop: (9 players) Hero is UTG+1 with
UTG folds, Hero raises, 2 folds, MP3 calls, CO 3-bets, Button Caps, 2 folds, Hero calls, MP3 calls, CO calls.

Flop: (17.5SB, 4 players)
Hero checks, MP3 checks, CO checks, Button bets, Hero calls, MP3 calls, CO calls.

Turn: (10.75BB, 4 players)
Hero checks, MP3 checks, CO checks, Button bets, Hero calls, MP3 calls, CO folds.

River: (13.75BB, 3 players)
Hero checks, MP3 checks, Button bets, Hero calls, MP3 folds.

Results:
Final pot: 15.75BB

Too passive? If I was sure that my TPTK was good I should raise to knock out draws, but with such a big pot, I don't think any good draws would fold.
I thought the Button could have AA, or AK. without a read I give the Button cap a lot of credit. is this a bad idea?

Have to lead flop, you are behind KK (unlikely, one in the hand one on board) and AA, and 1010 I guess too (button probably wouldn't cap 1010 preflop unless he was really good.
Then you can get all the guys between you and button calling, good chance button has AK as well, in which case you want to lead, get 1 to 2 callers in middle and if button raises I'd think about just calling, as he probably has at least AK here and you want the other two in the middle since you'll be splitting.