Loved reading your PTR! Now I thought I was a planner! I am so impressed with your planning and budgeting skills! Wow!
We are locals to DLR and are lucky enough to be current DLR passholders. We didn't renew January 2013 so we became Legoland passholders. By November, I had SERIOUS Disney withdrawals and bit the bullet and renewed to Deluxe passholders but didn't renew our Legoland passholders in January 2014 when they expired. HOWEVER...our family has REALLY missed the Legoland Waterpark. It's open again and next weekend they are opening another waterpark adjacent to the new water park. It looks toooooo cool! We are going to renew again!!!
You mentioned that you are unsure whether or not to do the water park. I'm not sure if this is your first time to Legoland. Since you're driving from DLR in the morning and going back that day/night, I'm not sure if you'll have enough time to enjoy the park and the water park. As a family, we easily spend most if not all of the park day at the water park! We really think the water park is a LOT of fun. We actually stayed at the Legoland Hotel last September for DD's birthday and it was so cool.
Curious to know what you decide to do. BTW, it's good when your trip will end because DLR's 1/2 marathon weekend starts. Crazy busy!