Your passport must be valid for at least 6 months after you arrive.
Onward travel
A return or onward ticket is required.
Proof of funds
You should have US$100 per day (minimum funds required per the source).
Pre arrival registration
All visitors, whether visa exempt or not, must complete the mandatory Mauritius All-in-One Travel Digital Form (safemauritius.govmu.org) before arrival.
Overstay penalty
Check with the embassy for overstay penalties.No overstay penalty figure was found against any source checked in this research, kept honest about that gap.
Currency limits
No currency limit listed.
Extension
Extensions are not available for this stay.
Also worth knowing
A Premium Travel Visa (launched October 2020) exists for financially self-sufficient long-term stays, noted but not modeled as the default tourist entry rule since it is an optional alternative route.
Reminder
Always confirm with the official embassy or consulate before you fly.