Looking to do a local trip within US

My boyfriend and I would like to take a 4-5 day trip to explore a state. We live in a city so I don’t really want to see another city. Looking for nature. I love walking and exploring. Was thinking of doing Arizona- Sedona, Grand Canyon, etc. it looks beautiful but will it be worth it if I can’t really do the extreme hikes or is it generally doable? My fitness level isn’t top notch at the moment.

Any other suggestions besides Arizona? It is for April or May.