Sounds like a nice project, Chiroeye. I haven't done this, but most posts on the topic do strongly recommend installing a barrier of some sort at the end of your sand area to combat the migration of the sand out of your swimming area. Putting some fabric down is also a great idea. As for a bed of gravel for your base, I really don't know if it's necessary if you use a fabric barrier, but others may have different thoughts. I think a real key is to use plenty of sand and then to be sure to use the swimming area frequently to keep it generally clean. Sediment and other materials will still work their way into that area, but regular use should keep it generally clean.
How about some pics when you get it done?
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