Firstly, enjoy it! I remember the first time I took my wife up after I had got my PPL. June had been in the back for a few lessons but suddenly she was sat in the front!!! It was an amazing experience realising we were going for a fly together rather than a drive. My advice is do a route you are comfortable with. Do a flight you have done before. Mine was a Biggin to Southend. I knew the route and I knew the frequencies, it all helps build confidence. Have a great time, it makes all the hard work really really worth while.