15/30 stars with AA, what to do on river??

just sat down for about 2 rounds, SB very loose and agressive-in every hand and raises often. not much on BB but seems like he is selective on hands
SB: posts small blind $10
BB: posts big blind $15
*** HOLE CARDS ***
Dealt to hero [Ah Ad]
EP: folds
EP: folds
MP: folds
MP: folds
MP: folds
MP: folds
HERO: raises $15 to $30
BUTTON: calls $30
SB: calls $20
BB: calls $15
*** FLOP *** [Ts 3s 5d]
SB: checks
BB: checks
HERO: bets $15
BUTTON: folds
SB: calls $15
BB: calls $15
*** TURN *** [Ts 3s 5d] [4s]
SB: checks
BB: checks
HERO: bets $30
SB: calls $30
BB: raises $30 to $60
HERO: calls $30
SB: calls $30
*** RIVER *** [Ts 3s 5d 4s] [7h]
SB: bets $30
BB: raises $30 to $60
HERO: ????

i did think about chking the turn and calling down river if there were bets but opted to go with betting turn.
comments??