Jhanananda,
gardening sounds like a very healthy hobby. I think I should get some plants. Plants are probably my favorite living organisms out of all on this planet earth.
I also look at gardening as a source of healthy, organically grown food, as well as the idea of a victory garden which could sustain me and my family during a famine.
My skillful hobbies would be running, working out, and hiking/walking. They tend to support my practice well. Morning run is like my morning meditation.
I look at health and fitness is a wise lifestyle that enriches one's life and a good foundation for the contemplative life, so I have been a hiker and cyclist most of my life until the present level of decrepitude has eliminated exercise altogether.
I also have one hobby that is probably somewhere in the unskillful spectrum. I collect certain items from WWII period. Its been my hobby since I was a kid. It requires some money but it is more like an investment since those items maintain value and can be sold at any time to other collectors. So money does not go down the drain. I considered dropping this hobby. But then my mind tells me, "you already have pretty much zero worldly interests left so why not keep this one for a little bit just to feel human once in a while". So I use this hobby to preoccupy my mind from time to time.
One just has to avoid "hobbies" that undermine one's contemplative life. Also, I happen to own a Vietnam era surplus military vehicle which I had bought because those engines were designed to burn almost any liquid fuel. You may not know, but one of my "hobbies" in the last 12 years has been turning recycled waste oils into diesel fuel.
And, I also see utility in maintaining older technologies which are often part of the reenactment community, because if you look into the
Carrington Event you will see the industrial revolution depends upon a quiet sun. So, maintaining technology that is strictly mechanical to operate during a direct hit of a coronal mass ejection of the sun might be critical for survival.