Cooling centers are again being opened by Greater Danbury area towns as the heat wave continues. Bethel's Municipal Center is open 8am to 4:30 today and 8 to 6 tomorrow for residents to cool off. The library is also open during normal business hours. Bethel Emergency Management officials are offering some tips to stay cool including running errands early, drinking plenty of water and avoiding strenuous activities. People should wear lightweight, loose-fitting, light-colored clothing and avoid alcohol and caffeine. Exposure to direct sunlight or long periods in the sun should be avoided, especially between the hours of noon and 4 pm, which are the hottest hours during the day.