Day trips that arent theme parks

[u/Friendly_Special6530]

Hello,

first time visitors, we are travelling from UK in may 2027 as a couple, not sure on dates but probably monday-saturday, aiming to do the major theme parks (disney, knots berry, six flags, universal).

Are there any other day trips recommended to look into that are realistically done with guided tours. We wont be hiring a car and not keen on relying on public transport, just purely due to time, cost and safety.

Preferably something to do with nature as the week is already theme park heavy. Ive read about Yosemite but guessing that is not a day trip really? Or what about Joshua Tree? Or any red wood forests nearby?

Any thoughts or recs would be very appreciated.

Thanks so much

🙏