DINOSAURS proved the biggest draw among last year's many Urban Council museum attractions. There was an increase of nearly 50,000 visitors to the council's museums last year, taking the total number of visitors to 2.06 million. The two million callers attended a variety of exhibitions and activities organised by the Science Museum, Space Museum, Museum of Art, the Museum of History and other council branches. Among the most popular events were the Science Museum's ''Dinosaurs Alive!'' exhibition, which attracted over 100,000 visitors in its first month; the Museum of Art's ''Rodin Sculpture'' exhibition, which recorded an attendance of over 40,000 for the five-week event, and the Museum of History's ''Dress in Hong Kong'' exhibition, seen by 66,900 people. In the past year, the Science Museum had been a popular venue for families and a science learning ground for students. It was patronised by some 520,000 visitors and 80,000 students. As the response to the ''Dinosaurs Alive!'' exhibition has been overwhelming, the Urban Council has decided to extend the show for another two months, till May 8.