Just use the cell phone to find the time, and you can get a car onto the L-Train tracks at the hove beach station by the amusement park. Just drive up the stairs, and drive onto the tracks, from there you can just drive around on the tracks or go to algonquin (Keep in mind you'll still get a 6 star wanted level for crossing the river). A good exit on algonquin would be going north on the tracks and jumping off of the tracks by the north algonquin pay 'n' spray. I was able to do it with Roman's Taxi on the first mission when you get off the boat, and with a turismo a little bit later, so it shouldn't be too difficult with any other car or suv.
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