A gift for my bosses? They have been understanding of my injury.?

I am a 22 year old full time student, and part time employee of an aquarium. A month ago I stupidly fell down a flight of stairs and broke my ankle in the process. I had to cancel my shifts at work for about 3 weeks and then make some conditions about my return. I am on crutches and wearing an orthopedic 'walking boot' and was told I'm not to stand at work by my doctor. Well everybody stands at their particular post for a shift. I was told that they would allow me to be the greeter at the entrance and they would give me a chair. They did indeed. Since I'm not allowed to drive they were also mindful of the fact I could only work open to 5 PM shifts on weekends since I was dependent on rides from my dad. Then there is also the issue of uniforms. Right before my injury they opened a new exhibit so the uniform temporarily changed from orange polos and black pants to a t-shirt that said 'Aquarium Staff' and had the exhibit logo on the back, and khaki shorts/pants. So I wore my khaki shorts with no problem. Now however, the uniform is briefly going back to the old one until summer hours. Since I can't put on pants over my boot, the managers said I can wear the orange shirt and the tan shorts. Finally, I just found out that despite my best efforts, the bone slipped and will not heal on its own. So now I need surgery. I informed them I will be back out of work for a few more weeks after that happens. They said 'Get better, and if you have any health issues like pain or swelling while working your scheduled shifts, tell us and you can go home for the day. Just tell us when you can return'. So I am blown away by their understanding of my problem. Mostly its these two managers, and a couple team leads in particular. Still there are lots of team leads, and I want a gift for the managers and those 2. Whats a good joint gift? Fruit basket or something? And can I give a gift for 4 people out of say 8? Because after all I haven't worked with all them when I returned? Or should I give individual gifts? or something for everybody including those who didn't get to work with me yet?
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Gift certificates for dinner at a nice restaurant. Be subtle when you give them to the people that you want to have them. Do not make a big deal out of it. It sounds like you work for some awesome supervisors. Be sure to tell them how great they are,
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