To do what I like to do, however much I like to do it
"To do what I like to do"=「私が好きなことをする、ということ」
"however much I like to do it"=「私が好きなだけやる」
Example context: "My hobby is go mountain climbing. It's great, because that is what I like to do, and I climb as much as I want to." (私は趣味は山登りです。それをするのが私は好きで、登りたいだけ登るので、とても良いですよ。)
この場合、次のような言い方ができますよ。
ーDo something you like as much as you want.
「好きなことを好きなだけする」
ーDo what you like as much or as often as you like.
「好きなことを好きなだけ何度でもする」
ご参考まで!