Depending on how much time you have, a California trip would be great. Southern Cal is awesome that time of year. San Diego will be mid 60’s-mid 70’s during the day. LA will be mid/upper 70’s-low 80’s but nonexistent humidity. Go east into the desert…Palm Springs, Joshua Tree, etc, it’ll be 110-120 but no humidity and you won’t sweat. Go north to Yosemite, San Francisco, etc. My parents did a trip similar to that and took the train between LA and San Francisco and loved it