Bikes allowed on Toronto subways, buses and streetcars from 0930-1530 and 1830-0630 weekdays and all weekend. All new buses have racks and they are being retrofitted to existing ones.
Here's the brochure (PDF)
Suburban rail is much the same deal, except foldable bikes at peak is being trialled. They also have
a biking trail promotion.
Interurban rail: $20 per bike per ticket irrespective of connections on trains with checked bags.
You can also pack a canoe... There is a summer
biketrain trip to the Niagara region.