Problogger Darren Rowse offers advice on what to do with your blog when you take a break:

1. Give your Blog and Readers a Vacation
2. Advance Posts
3. Retrospective Series
4. Guest Blogger/s
5. Guest Posts/Series
6. Blog from the Road
7. Open Mike posts

Although I’ve had guest bloggers at my personal blog, I may experiment with advance posts. Some blog platforms allow you to draft and post-date entries to appear sometime in the future. If you’re planning a week-long vacation, for example, prepare 7-10 posts to automatically publish while you’re gone.