Adding $150 to a $160 check is not unreasonable. They can claim up to $480 (treble the amount of the check).
Hawaii:
"Any person who issues a check that is dishonored for lack of funds or credit to pay the same, or because the maker has no account with the drawee, may be liable for the amount of the check and damages in an amount equal to $100 or treble the amount of the check up to a maximum of $500. However, in order to be entitled to the damages, the payee of the bad check must first make written demand for payment of the amount of the check not less than ten (10) days before commencing a civil action to recover the same is commenced, and the payor failed to tender the full amount demanded within the ten (10) day period.
The written demand to the bad check issuer must include a notice that if the money is not paid within ten (10) days, triple damages may be incurred by him. The notice must be sent by certified mail, restricted delivery, at the bad check issuer's last known address with a return receipt and marked "deliver to addressee only".
The actual statute can be found at:
http://www.capitol.hawaii.gov/hrscurrent/Vol11_Ch0476-0490/HRS0490/HRS_0490-0003-0506.htm