One of the participants wrote us a letter to say how much they enjoyed the trip and how they had experienced happiness for the first time in years.
Ysgrifennodd un o'r bobl ifanc a gymerodd ran lythyr atom i ddweud cymaint yr oedd wedi mwynhau'r daith a'i fod wedi teimlo'n hapus am y tro cyntaf ers amser maith.