Malaria tablets are not required for Mauritius. The health facilities are generally good and there is only one decompression chamber in Mauritius, which is located at the Victoria Hospital in Vacoas.
You are able to change your passport name before the honeymoon but the passport only becomes valid on the wedding day.
This page will help explain it http://www.direct.gov.uk/en/TravelAndTransport/Passports/Applyingforyourfirstadultpassport/DG_1741…
A passport is usually required to be valid for at least 3 months from the date of departure from Turkey.
Without something in writing I would not be comfortable with this and would endeavour to get a new passport.