Fine.
You can say "it's nice" in Welsh as "mae'n braf."
Either neis or braf.
cael diwrnod braf... this is really the answer
'Byddai'n braf cael pwll nofio yn yr ardal.'
Gobeithio y byddwch yn cael gwyliau braf.(I hope you have a nice holiday.)
"Have a nice weekend." would be "Cael penwythnos neis".
'You' is not a Welsh word.
It doesn't mean anything in Welsh; it's in English.
It's not a word in Welsh.
Do you mean 'What is the Welsh for witchcraft?' That is 'dewiniaeth'.
It's not a Welsh word.
'Carley' is not a Welsh word.