Traveler’s Notes . . .

Up to 25 species of butterflies flit through a garden at the “Briggs & Stratton Presents Butterflies Alive!” exhibit, which opened this month at the Milwaukee Public Museum and runs through Sept. 1. Information: telephone (414) 278-2700. . . . Also opened this month was “It’s Only Rock and Roll” at the Phoenix Art Museum. Among more than 100 items are portraits of rock stars by Annie Leibovitz and Andy Warhol, a collage of vinyl records and artwork inspired by hit songs. Information: tel. (602) 257-1222. . . . Average occupancy on North American cruise ships rose to 88% from 86% between 1995 and 1996, the Cruise Lines International Assn. industry group reported. Passenger traffic was up 6% in the same period. . . . Expect lots of company when you visit Houston restaurants. Zagat Survey’s food critics in that Texas city said they dine out, on average, 4.6 times per week--the highest rate among more than 40 cities where Zagat publishes guides.