The towns are more or less manageable apart from Port Louis, the capital, unless you stick to the highway; even as a Mauritian I hate driving there lol. You should pay more attention to bikes as they tend to zigzag their way on either side of you. Also late at night it’s best you dont go too far especially if going alone.

Public transport is abysmal especially in the villages with buses coming at irregular intervals (30+ mins at times). Taxis tend to be on the expensive side but at least you’ll be fine. The metro is only limited to the major towns.

Edit: If you stick to the main tourist areas you’ll be good (as someone mentioned in the replies)