You can use ferries (the main operator is CV Interilhas) or planes to the more distant islands.
Try typical dishes such as Cachupa, Lapas, Fresh Corn and Dried Fish. Great. The country's traditional cuisine is delicious and has African and Portuguese influences.
Only drink bottled water, research places you should avoid, only use licensed taxis and be careful of rip currents on the beach.
The local currency is the Cape Verdean Escudo (CVE) and although credit cards are accepted in many places, having some cash on hand is always a good idea.
Tropical and hot all year round, so bring light, comfortable clothing. And don't forget sunscreen – the sun is strong!