I always feel bad when service industry folks get slighted. Here's some customary tipping guidelines from the good folks at tipping.org:
— Tip if someone serves you personally.
— Tips go up according to circumstance, such as a delivery in bad weather, or if a customer sits for a long time at a table, preventing a server from seating another diner and getting a second tip.
— A tip may be warranted in what's normally a no-tip situation if a job is extra tough and done well, such as a snowplower who has carefully cleared a long, steep, curvy driveway.
— If you don't want a service, don't be afraid to say so: "Thanks, I'll get my own bag."
— If you do use a service, tip.
— It's OK not to tip if tips aren't a large part of a person's earnings; coming back is tip enough.
— Traditionally, business owners aren't tipped, but it's OK to offer a tip if they wait on you personally; they can refuse. Small gifts are an alternative.
— If you are unsure whether to tip, speak up; it's OK to ask what's customary.
A FEW INDUSTRY GUIDELINES
Taxi drivers: 10 percent to 15 percent
Beauty professionals: 15 percent to 20 percent
Restaurant servers: 15 percent to 20 percent
Pizza deliverers: $2 a pie is generous
A concierge: $5 for special service
A room-service waiter: 15 percent
Housekeeping: $2 to $4 per night. Leave the tip on the pillow, in a labeled envelope or at the front desk.
You don't have to tip in a free shuttle, but tip the driver $1 per bag if he or she helps you with your luggage.