Here is the route outline of the ballparks and other baseball stops that I have come up with so far. Plus, a few natural places of interest I added because I figured we might as well hit them while we are near them.
Leg 1: Tucson, AZ to Phoenix, AZ
Team 1: Arizona Diamonbacks
Leg 2: Phoenix, AZ to San Diego, CA
Team 2: San Diego Padres
Leg 3: San Diego, CA to Los Angeles, CA
Team 3: Los Angeles Angels of Anaheim
Team 4: Los Angeles Dodgers
Leg 4: Los Angeles, CA to San Francisco, CA
Team 5: Oakland Atheletics
Team 6: San Francisco Giants
Leg 5: San Francisco, CA to Seattle, WA
Redwood National Park
Team 7: Seattle Mariners
Leg 6: Seattle, WA to Denver, Co
Dinosaur National Monument
Rocky Mountain National Park
Team 8: Colorado Rockies
Leg 7: Denver, CO to Kansas City, MO
Team 9: Kansas City Royals
Negro Leagues Hall of Fame
Leg 8: Kansas City, MO to St. Louis, MO
Team 10: St. Louis Cardinals
International Bowling Museum and Cardinals Hall of Fame
Leg 9: St. Louis, MO to Chicago, IL
Team 11: Chicago Cubs
Team 12: Chicago White Sox
Leg 10: Chicago, IL to Milwaukee, WI
Team 13: Milwaukee Brewers
Leg 11: Milwaukee, WI to Minneapolis, MN
Team 14: Minnesota Twins
Leg 11: Minneapolis, MN to Detroit, MI
Team 15: Detroit Tigers
Leg 12: Detroit, MI to Cincinnati, OH
Team 16: Cincinnati Reds
Day Trip to Louisville Slugger Factory
Leg 13: Cincinnati, OH to Pittsburgh, PA
Team 17: Pittsburgh Pirates
Leg 14: Pittsburgh, PA to Cleveland, OH
Team 18: Cleveland Indians
Leg 15: Cleveland, OH to Toronto, Canada
Niagara Falls
Team 19: Toronto Blue Jays
Leg 16: Toronto, Canada to Boston, MA
Baseball Hall of Fame
Side Trip to hit Vermont, New Hampshire, and Maine (to say we have been to all states except Alaska after this road trip, I guess we will then have to do the Alaska road trip we have always talked about another summer)
Team 20: Boston Red Sox
Leg 17: Boston, MA to New York City, NY
Team 21: New York Yankeees
Team 22: New York Mets
Sports Museum of America
Leg 18: New York City, NY to Philadelphia, PA
Team 23: Philadelphia Phillies
Leg 19: Philadelphia, PA to Baltimore, MD
Team 24: Baltimore Orioles
Babe Ruth Birthplace Museum and Legends Hall of Fame at Camden Yards
Leg 20: Baltimore, MD to Washington, DC
Team 25: Washington Nationals
Leg 21: Washington, DC to Miami, FL
Team 26: Florida Marlins
Leg 22: Miami, FL to Tampa Bay, FL
Team 27: Tampa Bay Rays
Leg 23: Tampa Bay, Fl to Atlanta, GA
Team 28: Atlanta Braves
Leg 24: Atlanta, GA to Houston, TX
Team 29: Houston Astros
Leg 25: Houston, TX to Dallas, TX
Team 30: Texas Rangers
Legends of the Game Museum