Thanks for the quick replies.
We will probably take the train from Downtown Toronto to Niagara Falls; and either a taxi or car service from Niagara Falls back to Toronto Airport.
I have another question regarding tipping. For a $150 fare, does the taxi driver still expect a tip ? Niagara Airbus car service specifically mentioned gratuity is not included in the $150 fare, what is the customary amount to tip ?