<human>: My dad, who is nearing 70, designed and built - largely (and literally) by himself - a 2,000 sq. ft. lake house in West Michigan for our family. The property has been in the family for twenty years, but construction has been going on for four long years and now it's finished. Now we have an amazing place to go in the summers and weekends, and a place for grandchildren to grow up and remember. He and my mom will spend the bulk of their retirement there and my two brothers and I will inherit it someday. It's incredibly special to us all.

Also, just recently he and I were talking about the lake house project and he told me he was glad it was going to be finished soon because he was tired. This was the first time he's ever said anything like that to me - that he was wearing out. It was scary, like he was talking about mortality, or like I was suddenly aware of his age.

I want to get him something for Father's Day that will commemorate this and show how awesome he is in general. Any clever ideas?

Can you condense the text into three sentences or less?
<bot>: my dad is a badass and made an amazing lake house for our family, all by himself - i need a great father's day gift idea.