I always tip the shuttle driver $1 or $2, depends on how many bags I have. Wait staff with poor service will not get any tip from me, that blows away the purpose of a tip, but I will let them know about the poor service and why I won't leave any tip. Trina says she tips $15 for the taxi, I never tiped that much for a taxi, my usual taxi tip is from $2 to $5 tops. And I'll leave a couple of $ per day for housekeeping.