Many fun writing activities can help kids hone their writing skills. Here are a few ideas:

1. Writing prompts: Give kids a writing prompt to get their creativity flowing. For example, ask them to write about a magical adventure or imagine they are a superhero and describe their powers. You can find many writing prompt ideas online or create your own.
2. Story starters: Give kids a sentence or two to start their story, and have them continue. 
3. Collaborative writing: Have kids write a story together. One child starts the story, and then the next child adds a sentence or two, and so on. This activity helps kids learn how to work together and build on each other's ideas.
4. Journaling: Encourage kids to keep and write in a journal daily. Journaling can be an excellent way for kids to express their thoughts and feelings and help improve their writing skills.
5. Write a letter: Have kids write a letter to a family member, friend, or fictional character. Writing a letter can be a fun way for kids to practice their writing skills while expressing their thoughts and feelings.
6. Create a comic strip: Kids can practice their writing skills by creating a comic strip. They can write the dialogue, add captions, and draw illustrations. This activity can also help kids develop their creativity and visual storytelling skills.
7. Rewrite a story: Have kids choose a favorite story and rewrite it from a different character's point of view. For example, they could rewrite "The Three Little Pigs" from the wolf's perspective.

Remember, the key to making writing fun for kids is to let them be creative and give them plenty of opportunities to express themselves.