The key to turning science projects into something enjoyable, instead of something you dread because it seems like work or a chore, is to have the right attitude. Believe it or not, science projects can be an extension of your personality as much as blogs, journals, and your style of clothing. Make your science project something personal, something that you are truly interested in learning about. When people look at your science fair project let it be a projection of you and your interests.
The first and most important thing to consider when muddling through science project ideas is to determine your skill level. You may consider yourself a seasoned scientist and may want to tackle something very complicated, innovative, or process intensive. You may alternatively consider yourself a novice—and not an individual who quickly understands and processes science. If you fall into the latter category you may want to stick to a project that tried and true and not very time consuming.
The second thing you'll need to decide is your goal, or purpose, for the project. Are you doing the project for a grade? Are you doing it for fun? Are you doing it for profit? Clarifying your intentions for the project will weed through the projects that you think are not suitable to your needs due to time constraints and other limitations.
Another important consideration when choosing a science fair project is your own interests. Your interest levels vary, so only choose topics you truly want to learn more about. If you stick to what you are really passionate about, and what excites you as a learner, your project will be something you enjoy doing instead of something you dread doing. For instance, someone who is interested in computers, would fair better doing a computer themed science project versus something like studying the decomposition rate of leaves.