Options are:
(I) This will help to keep your entries in order and give you something to look forward to in a year or two. There are also regularly monthly or bi-weekly journals available which you can pass along to others..
(II) Hardcover notebooks are the safest options, because you can get preprinted very easily. A plastic or paper journal is also safe for use with daily writing..
(III) Choose one that is practical, but suited to your life, aspirations and goals. Be sure that it's not morbid, that prevents you from doing things you could never do without the notebook..
(IV) If you want to decorate the journal, do so either at the start or as an ongoing project. Ensure that the journal is ready for summertime..Choose from options above and answer: What most naturally follows?

How to keep a summer journal
Purchase a suitable journal that you can carry about with you.
It should be light, sturdy and have sufficient pages for your writing style. There are plenty of journals available in stores or you could even salvage something from your home among the notebooks you already have.
Answer:
(IV)