Well, apart from some of the already mentioned, I'd like to bring out a few more authors. (Btw, I never start naming titles, just the authors, since I read a lot and it would take ages to come up with every possible title worth mentioning.)
Wilbur Smith is one you might find worth looking to. This fellow tends to get sappy at times, but is generally likable.
There is a Spanish author Arturo Peréz-Reverté who has lot of mystique elements in his books, and also quite a scent of adventure. Especially <i>The Fencing Master</i> and <i>Seville Communion</i> (movie "Ninth Gate" starring Johnny Depp was made after this book) are worth mentioning.
And of course, if you fancy just some "turn-your-brains-off-and-enjoy-the-pace" reads, this thread can't be forgotten before mentioning the name of the modern adventure grandmaster, Clive Cussler.
Oh, and if you'd like to locate a book that is generally an Indiana Jones adventure with no Indiana Jones but fairly good copy, find <i>Sheba</i> by Jack Higgins.