Although tipping is included in the Carnival cruises I have booked it is the "minimal" amount. I use room service for coffee every morning, this is also my "wake-up call" so I feel like a larger tip is in order. My coffee is delivered at precisely the time requested every time. It may be coincidental but whenever I called room service during the entire cruise, I had my item delivered in never more than 5 minutes! That was worth an extra couple bucks to me!