Check out the village of Clarkston for different restaurants or shopping
You are welcome to check out the park beforehand. If you are planning on visiting it on Friday or Sunday you will need to pay at the gate. Please keep in mind the day of the wedding you do not have to pay the entrance fee, you will need to state you are attending the wedding of Jessica & Dylan. The Discovery Center closes at 5, so if you wish to explore it beforehand keep that in mind.
I take Kona here for walks a lot and there is plenty of trails to go on. There is also cement trails as well.
If you decide to hangout in downtown lake orion there is plenty of restaurants and shopping.