(someone's) picnic

Translations
что-то, что (кому-то) по душе
Dealing with numbers is not really my picnic.
Работа с числами - это не совсем мое.
Definitions
A situation or experience that is easy, pleasant, or enjoyable. Often used in the negative (e.g., 'not a picnic') to describe something that is difficult, unpleasant, or challenging.