I have two things I would put on a list as recommended reading for the San Juans. One is "San Juan Islands Cruising Atlas" by Evergreen Pacific. It has lots of info on where to go and not go, how to get through certain passes, and a lot of nice aerial photos; charts also. The second is a paperback book, "afoot & afloat - The San Juan Islands" by Marge and Ted Mueller. There is a lot of interesting reading in it, lots of info about what to do and see.