"I think cooking is really fun" is a way to express that you find the activity of cooking to be enjoyable.
This phrase is constructed using the present tense verb "think," which is used to express an opinion or bepef, followed by the subject "cooking," which is modified by the adjective "really fun."
Here are a few other ways you could express the same idea:
"I find cooking to be really enjoyable."
"Cooking is something I really enjoy doing."
"I have a lot of fun when I'm cooking."
Here are some examples of these phrases in context:
"I think cooking is really fun. I love trying out new recipes and experimenting with different flavors."
"I find cooking to be really enjoyable. There's something relaxing about being in the kitchen and creating a meal from scratch."
"Cooking is something I really enjoy doing. It's a great way for me to unwind after a long day at work."
"I have a lot of fun when I'm cooking. It's one of my favorite hobbies."