Part 2 is here) but I have now got to the point of having found almost all of the items on Rinda's list. What a great fun challenge this has been. Here's a few more crossed off the list.
#6. A metal bridge
I discovered two metal bridges during my search - one much prettier than the other - but I'm finding it difficult to choose between them so, for the record, both are included.
4. People playing a board game or card game
9. A tent
12. A public restroom, bathroom, or toilet
18. An overloaded truck, car, bicycle or other vehicle
20. A natural body of water
21. A photograph of you with a sign reading "2015 Summertime Photography Scavenger Hunt". Note: you may not use a substitute for this item.
And the possible substitutes for all but #21:
Alternative A: People eating outside
Alternative B: Someone holding an umbrella
Alternative C: A rocking chair