Here are some things I loved about 5th grade:
During math, we would have races on long division and multiplication on the black board. It would be up to 5 teams and each had a space on the blackboard. You read the question and they write it down and work it out. The teams progressivly earned points for the year, until one team wins. Our prize was a class party.(everyonewas included, but we didn’t care.)
Also we made up out solar system out of paper mache. I did the sun :D.We strung it up across the room in their respective orbits. It was a lot of fun making them. My sun was made from a beach bal, paper mache’d.
Another thing we did was an incubator. They cost between 40-100 bucks. Go to a local farm and get some fertalized chicken or duck eggs. It is a nice 2-3 month process of setting up the incubator and hatching the eggs. chickens are low maintence too. they don’t need to be specially fed since they feed normally from hatching.
Also, when we did history reports, we got to dress up like the theme of our paper. Mine was about the native Indians. I wore a headband with feathers and braided my hair up.
Another thing, which I’m not sure your familiar with is tese coloring grids. The sheetgives you 20-50 instructions on how to fill out the grid. It gives you the location on the grid and the colors and shapes you are to draw. In the end, you end up with a picture ranging from santa claus to shamrocks. They keep the class quite for a half hour or so as well. 
one last thing is a craft that my mom still has and looks at all the time. All ou need is a bunch of plain beige file folders and many different types of materials. You have them trace ne anothers feet on the material and cut them out. They place them on a mirror cut out of a dogs face. They fill in the face. Then they have to write a story either about a dog they want, had, or fictional story about a dog. They put that on sheets of paper followed by a binding of the mirror cut out behind it. Tie with ribbons. It makes a great little story book that every mom will save.
Mine has green felt ears and a red nose (I was absent the day they started and I got leftovers). Inside it had a story about my childhood german Shepard at ChristmasTime. It is so cute.
And of course, Mother’s day cards with homemade poems inside are a must (alt. to father if no mother present in home)
I hope these suggestions are good for you, sorry it is so long.