Do I have to leave a deposit? It is returned? The price on the hotel page says that it includes taxes, is there an extra fee?

Yes. The resort fee of about 120 U$s approx

We require a $100 incidental hold on your credit card during check-in, which is a temporary hold that reserves funds for any potential damages or incidentals during your stay. The hold is not a charge and is released within 24-hours of checking out, upon a successful room inspection. Your financial institution will determine how soon the hold is released from your pending charges. This process may take up to seven (7) business days but can take up to thirty (30) days outside of the United States. If you have any questions regarding the incidental hold after check-out please contact your issuing bank/credit card company.