Here are a few ideas to get you started. Most of these projects can be completed in a weekend.
A fun outdoor kitchen can be created using blocks and re-claimed wood.
(photo credit Better Homes and Garden)
Use smaller blocks as planters for table arrangements.
(photo credit Design Sponge & Design Improvised)
Start a raised bed garden.
(photo credit Savvy Gardening)
Add a succulent wall to an unused area.
(photo credit Apartment Therapy)
Make it easier to get from one level to another. This one will take more than a weekend.
(photo credit The Figure 5)
Create an outdoor bar or console.
(photo credit Hunted Interior)