An onward ticket is necessary but not always asked for. With the abolition of EU frontiers, Europeans are able to bring back the same entitlements as from mainland France. However you could run into problems if returning via Antigua, with a long, uncomfortable wait in transit. Take a direct flight to France if buying in bulk. There are nine hospitals and 15 clinics.
Hotels give the worst rates, then banks, but their rates vary so shop around.
Post offices change dollars but not all makes of travellers cheque, slow service. There is one exchange facility at the airport and it is closed all day Monday. It can be difficult to change EC dollars. It is included in fares. No commission charged on French traveller s cheques.