Unusually when reading a series of books I started, aged 8, with the first one (borrowed from my sister) and devoured the other 23 over the next 2 years or so. Along with the Five Find-Outers and Secret Seven, oh, and the "Secret ..." series and "The ... Mystery" series, these books were the basis of most of my primary school fiction reading and although they are derided and Blyton belittled by educationalists I was blissfully unaware of the damage I was doing to myself by daring to enjoy reading them over and over again. 
 This may be Treasure Island light but is very exciting for a young reader. The illustrations are memorable too, especially the ones of the raised shipwreck and of Dick with the massive splinter in his cheek.