A National Identity card or passport (expired for less than 5 years) is sufficient for french citizens.

For members of the European Community and Switzerland:
a passport without visa, an official ID, or a valid french carte de sejour is required.

No vaccine is required to enter the archipelago.
Only visitors coming from tropical countries must present an international vaccination certificate for variola.

In addition to the documentation, edited and distributed by tourism operators, there are numerous books and tourist guides about Guadeloupe and its islands.
In the best libraries you will find information to prepare for your trip under the best conditions before departure.
On arrival, a detailed road map will help you get around and visit the principal tourist sites.