Yes, tax is included, tip is not.
If you have less than 6 people in your party, there will be 2 suggested tip amounts at the bottom of your check 1) 18% 2) 20% (the exact amounts will be given).
Parties of 6 or more, an automatic tip of 18% calculated and shown at the bottom of the bill. You can charge that to your room, or leave cash at the table. If you choose cash, make sure you write "CASH" on the tip line of your check.