We did a morning sunrise tour of Tikal. For sunrise we sat on temple 4 and watched the sun come up over the park.
I personally could have done without temple 4 and think watching sunrise from the Lost World would be better.
The entire park is cool. Temple 4 is the biggest but in a way the least impressive.
I could have skipped the entire sunrise tour and instead I’d suggest you enter the park at 6:00 am when the gates open to the public the crowds would still be small and you could still have a fairly private experience in the park.