Today I took a walk in the park in the afternoon, and while I

enjoyed it, let me tell you that it was "no walk in the park". Ha! (this fun idiom means a difficult, stressful or not easy task).
You can also say that "it was no picnic" (meaning it was difficult to do). 🌲🌿🌾🌱🌳

In my defence, it was cloudy when I started out! ☁️