I LOVE this idea. What a fabulous plan you've worked out, lovely Penny!
I've got some ideas for trees I'd love to sit under any day:
Weeping Willows (the ultimate in thinking, reading and cloud-watching trees)
Olive trees (if olive branches are a symbol of peace, think about how much peace you get with a whole olive tree, Lol. I've got an old one and a young one in my own courtyard garden.)
Wonderful garden trees:
Cherry trees Peach trees
(Worth it just for the blossoms, but the fruit is a lovely bonus. Just watch for fallen peaches and cherries if you plan on sitting under them, Lol.)
A
giant oak wouldn't be a bad idea either. It depends on the size of land you want to use and how much time you're willing to give it. ; )
You might want to hop over to your local nursery to find out what works best with your soil and climate.
I'm still so frocking proud of you Penny!!