Yes Wear the Life Jackets below 2000'. Interresting that if you take the hired ones out of the sealed pouch you will normally be charged to re test them!
Best life jackets are known as heli or pouch type jackets. These are fitted to your waist prior to the flight and a tab pulled over your head if the jacket is required. This covers the requirement to wear the jacket and the jacket is with you at all times. There have been occasions where passengers have exited a ditched aircraft (first survival instinct) only to find once outside that there life jackets are sinking with the aircraft.
Enjoy the trip, its alot of fun (the first 100 or so times anyway). Plan to land at the main airports, alot of the Islands have strips but they are normally rough and short.