OP,sounds like a good fun trip to me. I don't think that bit of extra mileage will be too much,just pace yourself and see what your body tells you. I've been giving some thought to a simiar ride to some property we own/used to live at (last year the house burned),where my Grandparents live next door. It'd be around 100 miles each way,and like you said,wouldn't need so much stuff (though I doubt my ability to ride it all in one day),I'm thinking Spring for me however. Be sure to post pics and ride report for everyone to enjoy it with (or rather,vicariously through) you