Every monthly science journal in the NSTA Learning Center contains 5 E lesson plans. If you are a member of NSTA, you have access to all 4 journals electronically. You would be especially interested in the Science & Children journal articles. Also, if you go to NGSS@NSTA, you will find sample lesson plans at the bottom of every page of the standards by grade level and topic.
Let us know what grade level you are teaching in science and what topics you have coming up. That way others can offer more specific, fun ideas for you to try out.