1. Untapped Cities offers a variety of Bronx tours, including a Little Italy walking tour, a South Bronx graffiti tour, and a Bronx food crawl.
2. Big Apple Greeters offers free, personalized tours of the Bronx led by local volunteers.
3. The Bronx Museum of the Arts offers guided tours of its exhibitions and collections, as well as walking tours of the Grand Concourse and other Bronx neighborhoods.
4. The Bronx Historical Society offers walking tours of various Bronx neighborhoods, including Mott Haven, Fordham, and the South Bronx.
5. Bronx Tourism Council provides information and resources on a variety of Bronx attractions and tours, including walking tours, bus tours, and boat tours.
6. Bronx River Alliance organizes kayaking, canoeing, and other recreational activities on the Bronx River, as well as guided nature walks and historical tours of the river corridor.
7. Woodlawn Cemetery offers guided tours of its historic grounds and mausoleums, including the graves of notable figures such as Duke Ellington, Miles Davis, and Fiorello La Guardia.
8. The New York Botanical Garden located in the Bronx offers guided tours of its extensive grounds and gardens, including the Peggy Rockefeller Rose Garden, the Enid A. Haupt Conservatory, and the Native Plant Garden.
Note: The availability of tours may vary depending on the time of year and other factors. It's recommended to check the respective companies' websites or contact them directly for the latest information on tour schedules and prices.