Money
Are you old enough to remember travelling without credit cards, ATMs and smartphones? Then visiting Cuba will be a trip back in time. Bring cash to change into convertible pesos, also known as CUCs (not CUPs, the currency used by locals). And budget carefully: there are only a handful of ATMs in Havana. On paper, one US dollar is worth one CUC, but the Cuban government takes a 13 per cent fee, so you get 87 cents for your dollar. Privately, Cubans may offer 90 cents or more on the dollar but be careful who you trust.
I have MasterCard, Visa and American Express cards but none could be authorised for use in Cuba in May. Even when the rules change (or if your card is from a non-US bank), businesses rarely accept plastic.
WiFi
Cuba's offline culture makes trip-planning complicated. It takes days to confirm arrangements because most Cubans cannot check email from home. Automated online reservations are rare. If you must go online in Havana, hotels sell internet cards for lobby WiFi for US$4 or US$5 ($5.90 or $7.37) per 30 minutes. Even then, though, the WiFi may not work. A paper map is essential as drivers don't have GPS and there is no Googling an address on the fly.
Food and drink
Government-run cafeterias in public places like museums are dreadful. Stick to "paladares" - privately owned restaurants. My best meals were at 304 O'Reilly (the restaurant name is also the street address), which offers trendy, light fare (terrific ceviche, lobster and pasta), and Cafe Ajiaco in Cojimar (Calle 92, number 267), whose owner showcases what he sees as the best of traditional Cuban cuisine. For a drinking tour, consider Ernest Hemingway's advice: "My mojito in La Bodeguita, my daiquiri in El Floridita." The handwritten quote, allegedly scribbled by Hemingway himself, is framed at La Bodeguita del Medio over a bar mobbed with tourists. The Floridita is nicer: great air-conditioning, icy daiquiris and a bust of Hemingway, perfect for selfies.