Flopped Top full - deep 2/5NL

[SubGreen]

This hand happened last year, just wanted to get some ideas

Wynn 2/5
UTG is an older man, plays straightforward semi-tight weak stack of ~700
Button is new player to game, the young kid whipped out huge roll to cover my stack.
I appear LAG but have been in line most of the time (playing a lot of hands but not for big raises)

UTG raises to 25
Hero calls in middle pos with 88
Button calls
BB calls

Flop (~100) 4h 8h 4s
Checks around
Turn (~100) 6h
UTG bets $50
Hero calls
Button calls
River (~250) Jh
checked to hero who bets $200
Button raises to $500
UTG raises all in $675 total
Hero?