Welcome to the Lake of the Ozarks! This should be a fun simple 2-stage multi. The first stage will require some sort of watercraft--a boat, PWC, or kayak will work just fine. Once you gather the information from Stage 1 you will be able to calculate the final coordinates. To get the final cache you will need to be back on dry land in a vehicle. Do not attempt to navigate directly from Stage 1 to the Final in your watercraft nor by jumping into the Lake, swimming to some spot on land and then making some long trek over land to the final. Not only doesn't that make sense here, you would not be able to do so without crossing private property.
Stage 1: Hopefully you've enjoyed your boat ride to Stage 1. If you look to your SW you should be directly in front of two signs. The bottom sign has both black and red letters on it. That is the sign you want to use to calculate the final coordinates. There are 8 words on the sign. In the code below W1 stands for "Word 1", W2 for "Word 2" etc. The code L1 stands for "Letter 1" within that word, L2 for "Letter 2". etc. Map letters to numbers in the usual way starting with A=1. If a letter maps to a two-digit number, use the second digit. The final coordinates can be calculated from Stage 1 as follows:
N38 W1L2 . W4L1 W8L6 W7L5 W92 W5L5 W1L6 . W1L4 W4L3 W6L1
Good Luck!