IF the holiday camp is in the UK then it is worth considering the Vodafone dongle.  To buy they are less than £20 and a months PAYG sim is £10 for 1GB or £15 for 3GB.

If the camp is not in this country then you will be far better off looking at buying a dongle and SIM where the camp is located.

Another option if holidaying in this country is if you have a smart phone, (iPhone, Galaxy etc), then you can set up a personal hotspot connection on your phone which your laptop could connect to.