My husband and me are planning to visit for first time US and we are arriving to Las vegas on August, and he´s so excited about the idea of climbing mount Whitney. But we don´t have a clue on how to get tickets, and to book correctly using
https://www.recreation.gov/. It seems to us the main route to go it´s not available for the week we are there. We arrive on August 11, 2024.
Could someone tell us how we can find an alternative to get to the peak? we want to spend one night and do the whole route in 2 days, if not possible, how can we get an option of 1 day?
Please I'm getting crazy

trying to understand the booking system in US. And we are travelling from Costa Rica.