If you’d like, you can visit the gym on your rest days and focus on very light cardio or mobility exercises.
Alternatively, you could separate your resistance training and cardio days to increase your gym time if that suits your goals.
You do not have to do absolutely nothing on your rest days, that’s a common misconception. As a beginner, you are likely not accumulating enough fatigue to warrant complete rest if you still have the motivation to be active. It is perfectly fine to engage in some light conditioning work, whether walking, hiking, playing basketball, or biking.
You could also do something more intense, like a burpee ladder or a metcon workout. This type of activity helps improve your conditioning and aids in recovery, allowing you to build a stronger foundation for more challenging workouts. Keeping your heart rate up daily is generally more beneficial than doing nothing.
I understand the urge to keep pushing when you are seeing great progress, but rest is essential. Here’s a tip: you don’t have to be completely inactive on rest days. On weekends when I skip the gym, I start my day with a long hike with my dog and then do a cardio session in the afternoon on Saturday.