Most of us work well if we are working towards something. In a classroom it is important to have some structure and approval about what the rewards will be. Instead of just giving a student an iPad to have free time it's better to structure the choices and provide some guidance about what you expect the student to be doing.
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Choice boards are a great way to let students have choice from pre-approved options. Make sure that students know how to use all of the choices on the board.
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Word Work Choice Board
Journal Choice Board
Math Choice Board
Instead of setting your students loose for free time on YouTube why not curate some pre-approved, high interest videos in Book Creator(or D2L or Google Slides or Sites) for them to watch. You could even have different "books" that last different amounts of time so that if a student has earned 5 minutes of free time they can pull up a 5 minute book of videos.
Minecraft EDU
Block Craft
Bloxels EDU
Scratch
Code.org
Lightbot
iMotion
JigSpace