need to get from bay street, toronto to oshawa botanical gardens - five people travelling - would taxi be very expensive
Oshawa is approx. 38 miles / 62 km from downtown Toronto. A taxi would be very expensive.
I would suggest looking into taking a bus from the Toronto Coach Terminal, located at 660 Bay.
An alternative would be to take a GO Train from Union Station, located at Bay & Front Streets, to Oshawa.
You could then take a taxi the short ride, 3 miles / 5 km, to the wedding.