Travel Clinic: Hawaii honeymoon, Gozo beaches, Italian trains

Can you recommend a honeymoon in Hawaii? We’d like a luxury hotel on one island, and a secluded hotel on another. Sarah Murray, Dublin The main decision is whether to stay on Oahu, where Honolulu makes for a ritzy introduction to the islands, but has a city-beach feel, or to opt for a more out-of-the-way location.