This is easy, ban rc boats, its killing too many people...
Life vest at least, its simply common sense and if the person is not in shape, much worst.
Many department stores sells boogie boards, slap some swim fins and goggles and all set. Thats what I use, but I do stay active, run, cycle, visit the weight room frequently.
Cold water is another beast, hypothermia, cardiac arrest, it gets ugly real quick.