Here's my suggestion. Suppose you have activities A, B, and C:
1. Work out how much time you have in total, to spend on A, B, and C. Draw up a schedule, with blank boxes for the times you have available.
2. Work out what proportion of time you want to spend on each of them (e.g. 1/4 on A, 1/4 on B, 1/2 on C).
3. Decide what part of the day is best for each activity. For instance, A may be better in the morning, and C in the evening.
4. Distribute your activities in the proportions you decided in #2, and amongst the parts of the day you decided in #3.