Ideas for activities for neglected horse?

i asked this question a few days ago but i only got 2 answers and they wernt very good answers. soo my friend has a horse that she neglects. what im going to do is everyday in the summer, every weekend and one or two days during the week after school im going to go visit the horse. im pretty much a beginner so im not going to ride her and if i do it will be when/if we bond and at the end of summer when im hopefully more experienced. i need ideas of fun activities i could do with her on the ground and how to do them. im going to spend alot of time grooming her and time with her outside the fence when she is in the field (she almost killed two horses when someone put them in the field with her) but shes alittle better with people, exspecially when there just on the outside and not in with her, so im going to do that too. i need more ideas though like fun activites and how to do them, and more ideas for groundwork.. im also going to lunge her when the weather gets warmer and the snow is off the ground because they dont have an indoor. i can do the tricks that need space and the ones that dont, i just need ideas. im really confident in this and i really want to give her a try, everybody hates her and wont do anything with her except feed her. no rude answers. thank you.