Besides the new player bonus (Bet $80 within a week, Get $60 deposited into your account), there is also a Belmont Stakes superfecta bonus. Hit the super in the Belmont (even if you hit it for a dime), and you'll receive a $20 next day bonus. Check the website for all details:
https://bet.horseplayersbet.com/
PM me if you have any specific questions. Thanks.