I used to live in Lytham-St Annes, which is just next to Blackpool. Blackpool is a fun place and the Illuminations are much loved by kids and grown-ups alike.
Like any place where large quantities if alcohol are consumed, there is a possibility of
fights breaking out, but in my opinion, no moreso in Blackpool than any other place.
If you go be sure to visit Blackpool Tower. Have fun!