Exodus 20:9 Six days you shall labor, and do all your work, 10 but the seventh day is a Sabbath to the LORD your God. On it you shall not do any work, you, or your son, or your daughter, your male servant, or your female servant, or your livestock, or the sojourner who is within your gates.
The first thing we see God doing, in Genesis, is working. He declares it to be work in Genesis 2. God worked for six days. He is a God who works.
Genesis 2:1 Thus the heavens and the earth were finished, and all the host of them. 2 And on the seventh day God finished his work that he had done, and he rested on the seventh day from all his work that he had done. 3 So God blessed the seventh day and made it holy, because on it God rested from all his work that he had done in creation.
Since God is a God who works, when he made man in his image, he gave him work to do. Genesis 2:15 The LORD God took the man and put him in the garden of Eden to work it and keep it.
Work not only reflects God's nature (as he is a God who works) but is also something he gave Adam to do before he fell into sin. At this point in history, nothing had been soiled by the fall. Consequently, the work that God gives man to do, in and of itself (and within whatever other boundaries God puts around it in his word) is good. (It is sin that makes this good work difficult.)