Great job Nanako! I think this is what you're trying to say: "This is one of my favorite places that I visit as often as I can." You had the right idea, but need to work on your sentence structure a little bit. Keep up the good work!

Hello

There's a favorite place of mine that I visit as often as possible.

Hi, Nanako. I think an easier, more natural way of saying it is. "I have a favourite place that i visit as many times as possible" or you could say " There is a place that i consider to be my favourite, i visit it as many times as possible "