Agree with Keef, I wouldn't want to be buzzing around the overhead if there is parachute activity. Straight in approaches are easiest from a local nav perspective but can make it hard to judge the approach with regard to height, plus there is the question as to who has right of way - when exactly are you in finals?
If no overhead join is possible then a compomise of a join at the top of the downwind leg might work (although you'd have to maneouvre around the ATZ a bit) or perhaps a base-leg join.
The best option is to give the airfield a call before you depart to get a briefing and discuss the options.
Happy flying!