Favorite less-traveled spot: A series of trails that complete a 4.5- to 5-mile loop that connects Penobscot Mountain and Sargent Mountain.
Start at the Jordan Pond House and take Spring Trail to Jordan Cliffs Trail to the Sargent East Cliffs Trail to the Sargent South Ridge Trail to the Penobscot Mountain Trail, which will reconnect with Spring Trail.
Sargent Mountain is Acadia's second tallest peak and the hike offers panoramic views of granite domes on mountains to the east, Jacobi says.
"I find myself going there a lot," he says. "If you pick your times and days, you can avoid the crowd."
Favorite spot to view wildlife: Sieur de Monts Spring and Isle au Haut. While the park is home to deer, otters, bald eagles, coyotes, lynx, foxes and fisher, Jacobi says Acadia is really a bird-watcher's paradise. He recommends Sieur de Monts Spring for listening to singing birds, and Isle au Haut for watching migrating flocks in the fall.
Most magical moment in the park: the dozen times each spring when a combination of heavy rain and snow-melt create unseen waterfalls. Jacobi discovered this in 1988 while hiking with a friend during a storm.
"It's another little secret," he says." There are a dozen waterfalls at Tarn after a heavy rain. It only lasts a couple of hours but it's really neat."
Oddest moment at the park: Watching a helicopter take off from a yacht in Bar Harbor and land on top of different Acadia mountains so the owner could pick blueberries. While Acadia's blueberries are fair game to all, landing a helicopter on national park land isn't.
"They didn't bother to give him a ticket," he says. "You can pick them (blueberries) for personal consumption,"
A ranger's request: Always keep your dog on a leash. Click here for a list of Acadia's pet-restricted areas. "It not only protects wildlife, but it also protects your dog from getting porcupined," he says.
Another park he'd like to visit: Chiricahua National Monument in Cochise County, Arizona. Tucked along Arizona's southeastern border with New Mexico, the Chiricahua Mountains were a stronghold during the 19th century for Apache tribes who were wedged between the U.S. Army in the north and east and Mexico to the south. Parts of the park flood every year during summer monsoons and the best times to visit are in the fall or spring.
"I went there once and found it to be positively charming," says Jacobi. "I thought the trails were wonderful."
What national park would you like to visit? Please share your thoughts in the comments section below.