Shade sail - great way to give shade. Can be taken down when it's not needed. Loads of colour choices.
Waterproof Shade sail 4 x 4m Square
Other Tents and Canopies 179019: Patio 10’ Foot X 13’ Rectangle Sun Shade Sail Canopy Green Waterproof Polyester BUY IT NOW ONLY: $47.02
Sliding Patio Cover for instant sun OR shade (This couple built a monstrous steel structure but these can be adapted to a small deck).
Canvas providing shade instead of a more expensive umbrella - This would be easy to do - AL MARE
Kookaburra 3m Triangle Mushroom Waterproof Woven Shade Sail
shade sails carport - Google Search
Kookaburra 3.6m Square Yellow Waterproof Woven Shade Sail £59.99
Lidgard Shades - Shade Sails And Canopies - Pool shade for summer
Waterproof Patio Sails | Outdoor Shade Sails to Protect Courtyard from UV Ray and Rain | House ...