Central Park
There were many great shows in Central Park in those days, and I made it to a few.
For a teenager from Long Island, it was definitely a blast to get into the city by train, head up to the deli on Sixth Avenue near the lower entrances to the park where you could buy a beer in a paper bag, and then go right into the park for the show. There were many good spots to see some of it and hear all of it right there in the park if you were inclined to save the money on a ticket and sit outside the main venue.