With the Mets’ and Yankees’ seasons in full swing, and thousands of Brooklyn children experiencing the joys of Little League, this Saturday—and again on May 10—Gotham SideWalks will present Bike Brooklyn Baseball Tour, an intimate journey through the formative century of 1850 to 1950 when professional baseball was dominated by New York teams and our beloved borough played a leading role. Advertised by Rich Garr of Gotham SideWalks, as “100 years of baseball in 10 miles,” Bike Brooklyn Baseball Tour takes a leisurely three-hour trek through the seminal sites and historical record of Brooklyn’s unprecedented place in baseball history. “Our tour uses the 50s as a bittersweet endpoint,” said Garr in…