Chicagoans head outside for hottest day of 2016 so far

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CHICAGO -- It's the hottest day of 2016. And when the temperatures climb, Chicagoans head to the lake. And tonight, the warning from the city's fire department: stay hydrated!

On a hot day like today, the water fountain is busy, and the glittering lakefront is the place to be.

From bike riding to book reading, so much to do, so much to see.

The pedestrian tunnel to Oak Street beach was  filled with music and people.

After back to back 90-degree temperatures, the Chicago Fire Department says there have been nearly 50 heat-related transports in the past 48 hours.

In the meantime, Chicago police are patrolling the beaches on foot, bicycles and ATVs.

Police shut down car access to the beaches at North Avenue and Oak Street beaches.