Years ago I used to have a separate choosing area, that the children in Year 1 could go to when they had satisfactorily finished their work. I used to put out different activities for them to choose from. (Once it was an enormous puzzle of the British Isles that took a week but they all did a piece/s and they loved it). In Reception I had 3 tables and I would work with one group and my T.A. would supervise the other groups, but I did not have any outdoors access (This was years and years ago) The children would come in the morning to different tasks put on the 3 tables. But only 1 group would work with me while the others had free choice.