Jake, First off, how I envy you for living in Iowa...BIG BUCKS...anyways, I live in Michigan and have been bowhunting for 20 years...If I were you I would hunt that state park right away and shoot a doe as they are more relaxed in early season tending to their fawns and not being chased by bucks yet...not to mention getting some practice at shooting a deer and experimenting with your broadheads and yardage. I do not do much calling in the early season because deer are not very vocal that time of year...Just pick a spot downwind of the heaviest deer trail you can find in the state park [The heaviest trails are almost always made by does...Buck trails are hard to see...they usually look like rabbitt trails...very faint with not many tracks]...In early season, does are looking for food for their young and tend to move around 9:00 to 9:30 in the morning...stay on stand till 10:30 or so if you can....although, evening hunts are most productive in the first few weeks of bowseason....As far as whether to hunt your food plots or river bottom acorns, It depends on what is growing in those food plots....If I were you, I would hunt half way up the ridge that runs between the river bottom and the food plot if possible....If this is not possible, than hunt the river bottom acorns most of the way up the hill watching the river bottom....In the past 8-10 years, I have killed most of my bucks from ground blinds believe it or not...you have to be as scent free as possible and must find the perfect location to build these blinds...natural stick blinds I mean....First off, pick a tree wider than you about 2-3 feet wide and build up dead logs and branches from the base of that tree in about a 4 by 6 foot circle or square high enough that when you sit on your stool or chair it comes up to your chest or neck level....that way when deer approach, you are concealed up to your neck with only your head showing which allows you to move around freely during your hunt as long as you dont move your head....a headnet or facepaint is a must....then when your deer is moving into range, you can draw your bow back while sitting without being seen...and slowly rise up to take the shot....The big tree trunk should be in front of you so you can draw and stand up without being seen....when the deer walks out from the other side of the tree trunk, you are already drawn and ready....dead deer. It is not necessary to hunt from a treestand and be successful if you play the wind and are pretty scent free.....hope this helps you this season...It should.