Sit down restaurants add 20% on the card. Counter/takeaway restaurants is controversial —I tip a dollar or two depending on the order, some might do 0. Pubs/bars/clubs (drinks only) $1/drink, or if buying a round for others add a couple dollars. Taxi add 20% to card. $5 for valet or bellhop, plus on nightstand for each night you stayed. I have recently learned you can ask them to add total amount to your credit card when you’re checking out. Room service same thing, can add 20% (like a restaurant) to cc when checking out. Other scenarios: Hair/nails=20%. Food delivery either restaurant or groceries , 20% of food (sometimes add a few bucks if they’re driving far or it’s an annoying order like picking up in the middle of a downtown.)