Maui is known for some of the most amazing hiking in all of Hawaii, with a trails for virtually all skill levels and a myriad of different environments - from the lush Waihee, to more barren Haleakala, to volcano-like surroundings in La Perouse and everything in between.
Some resources to get you started:
Hawaii Trails Map & Information - https://hawaiitrails.hawaii.gov/trails/#/
Featured Hikes on Maui - https://www.hawaiirealestatesearch.com/blog/maui-hikes-for-all-levels.html
Directory of Trail Maps - https://dlnr.hawaii.gov/recreation/nah/maui-trail-and-access-maps/
As always, use caution when hiking, contact local authorities for updated information, and hike in groups, with appropriate supplies.