Wanted to post something before I forget. First, tickets won’t be easy to get if you wait to the last minute, especially for the free Wednesdays. I just went on a Thursday and it didn’t feel crowded (the museum was very sparse) but there were people who were there for the Cuevona de Ardines (big cave, no paintings) and had to come back the next day to see Tito. The website is filled with good info, including what times don’t coordinate between the two caves. If you’re coming in Wednesday, start thinking about tickets a couple months before if you're particular about a time.
The cuevona is only about a half hour visit or so. You go up some stairs and into a large cavern where you get some explanation of it. It’s worth seeing if you can.
Tito Bastillo is the main event. Both of these tours are in Spanish. For Tito, there are a couple options to make it more understandable if your Spanish isn’t great. After the main gate of the caves but before you go in, there is a QR code outside before the bridge going over to Tito. It links to a tour in English. The problem is you can’t take pics so if it’s in your phone, you’d have to have it out to stop and start the recording. I don’t know how they’d feel about someone having a phone out. Probably not great since photos are not allowed. If you have a smart watch that might work. I didn’t have my earphones with me so didn’t try this to tell you if it would be useful. The recording is abt 15 minutes long so there isn’t really time to listen to it before going in. What I’d recommend is to start in the museum, and make sure you get to the video in area 4. It’s not long and gives an overview of the paintings. The rest of the museum, which isn’t large, also has info on how the caves formed that the guides review. It’s a nice little museum and worth seeing anyway, but doing some of it before the cave visit would be helpful. You’re allowed back in after.