Personally I'm a fan of the classics. Recently read the original Lost World by Arthur Conan Doyle (1912). Fantastic.
Time Machine by H.G. Wells. Even if you read them as a kid, they're worth rereading. And if you never read them, they're a must. I dropped Journey to the Center of the Earth after the 19th passage about mineralogy.
Yes they're straightforward with simple plot structures, but they're great reads with an air of nostalgia to them.
Chronicles of Narnia. LOTR. Also worth rereading.