Okay, I've got another one. This one's not too difficult. Let's begin!
I originally found this strategy on YouTube titled Squash Party. It wasn't successful, but it was awesome to watch. But it gave me an idea.
Plant this entire strategy, then dig it up. (I'm not joking. Clear the entire lawn AND pool.) Now replant it in the direction shown by the arrows. Only plant Lily Pads for the next Squash in line. There's not enough sun to completely refil it, so where do you stop?
The entire setup will leave you with 1850 sun. An entire column of Squashes costs 350. Continuously subtracting this will be much faster than strictly following the line. Column 1 gives you 1500. 2 goes to 1150. 3 is 800. 4 is 450. 5 is 100, so we end in column 6. 100 sun is 2 Squashes, so we end at E6.
I have more planned. I'll be back soon.