Critique my 14 day Guatemala itinerary!

Hi guys, it's my first time going on a solo trip and I've been tweaking my itinerary slowly with the help of ChatGPT and I think I've got it down. Do you guys have any advice on what I can do to make it better

Day 1 (Sunday)

Arrive to GUA at 12:30 pm, shuttle to Antigua at 1:30pm (is this enough time to catch the shuttle?, the next one would be at 4pm and idk how to kill 3 hours at the airport).

Day 2-3

Antigua - Not sure what to do here, still need to research. Looking for reccs!

Day 4

Acatenango Hike

Day 5

Return from hike, shuttle from Antigua at 4pm to Atitlan, arrive at 7pm.

Day 6-10

Lake Atitlan. Thinking of splitting time between San Pedro and Santa Cruz. (Is this enough time in Atitlan)

Day 11

Shuttle from Atitlan at 7am to Semuc at 6pm.

Day 12-13

Explore Semuc, not really sure what I'll be doing here yet.

Day 14

Shuttle from Semuc at 8am to Antigua at 5pm for one last night in Antigua before going to airport at 7am the next day.

First solo travel ever and first time spending this long in another country so not sure if im doing it right. Appreciate any feedback, thanks!