Wiki Voyage, as part of the wikimedia project, has an incredibly useful tool simply called "Books". This features allows users the ability to collate various articles into a collection using the book creator tool. Wikivoyage books can be easily saved, rendered electronically in PDF, EPUB, ZIM or OpenDocument format, or ordered as a printed book.
The Help:Books page explains everything you need to know to use the feature.
Here is a sample workflow I use to create a custom guidebook for a particular region or regions.
The structure of Wiki Voyage is hierarchical with pages existing under categories. For example, "Category:Germany", is under "Category:Central_Europe" which is under "Category:Europe".
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Locate the highest level category you're interested in using the Category search page
Example: Category:Balkans
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Add a chapter to your book for that category (Help:Books explains)
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Open the first sub-category you're interested in
Example: Category:Albania
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Add the page for the category if you want it
Example: Albania (which is NOT Category:Albania)
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Add all subpages and sub-categories by clicking Add this category to your book
If you want to exclude some sub-sub-category pages, then you'll need to add each sub-sub-category manually.
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Repeat, adding new chapters as necessary, until you're book is complete
Example: Western Balkans: A Guidebook to the Former Yugoslavia