For all except the internet access, I have a Samsung C3350 mobile phone. It's a basic phone, not a smartphone, and it weighs a tonne, but that's because of the size of the battery. It's dustproof and almost waterproof.

It has an excellent FM radio tuner and if the autotune doesn't find the station I select the frequency manually. I don't use the music player, but I've just tried it and it works fine (I know nothing of itunes). I charge it about every 10 days, so even with heavy use it should last more than a weekend.

It's a couple of years old, but there's probably an equivalent around.

Phil