If you've the time and the money, flying in other countries is a lot of fun - you can fly over some very interesting things very cheaply in the US.
I went to Arizona straight after I got my PPL, did a flight review and checkout, then some mountain flying instruction then flew around the Grand Canyon, in to Las Vegas etc.
South Africa is another great place to go flying.
There are lots of interesting things to do in the UK, but California's weather and prices look very attractive at this time of year.