Today, I am putting together some furniture. I also went for a walk and drank soy milk. It was a healthy day. Recently, I have been very busy, so I did not have much time for myself. That is why I really enjoyed having a relaxing day like this. I will sleep deeply while watching anime.

Today, I put together/have been putting together some furniture. I also went for a walk and drank soy milk. It was a healthy day. Recently, I have been very busy, so I haven't had much time for myself. That’s why I really enjoyed having a relaxing day like this. I will fall asleep while watching anime and sleep really well. Great work! I would use the present perfect to talk about your recent hard work. You have been working hard lately so that is why today you enjoyed some time to relax.

Today, I am putting together some furniture. I also went for a walk and drank soy milk. It was a healthy day (a pleasant day). Recently, I have been very busy, so I didn’t have much time for myself. That’s why I really enjoyed having a relaxing day like this. Tonight, I will fall into a deep sleep while watching anime! (Tonight, I will sleep very soundly after watching anime.)