A lot of people don't understand how to maximize their leisure time. It's because they're stupid, but I'll take pity on you. Here's how you do it right. Overplanning. Whether it's a weekend free, or a full-on two-week vacation - simply expand or contract proportionally, based on how many 2-day increments you've got waiting to fill up with itinerary!
For any given 2 day period.
Plan for 3 days' worth of activities.
Only get around to 1 of them.