Turns would be made using 25-30 degrees of bank, the same as you would use with passengers. I believe the previous posters comments are somewhat irrelevant because you are in a landing configuration. This will allow you to manoeuvre at a lower speed and still provide you with a 30% margin over the stall speed. The circuit size depends on where you are but you'll find that we will often be flying downwind at 1,500' instead if the regular 1,000'.
As for fun it all depends. Most of the short haul guys I know enjoy these things because they regularly fly automatics off, raw data, directors off etc. The long haul guys often appear not to be so keen, possible due to lack of practice.