I visited this WHS in July 2019 for the first time in my life (despite of living not so far from it - about 2 hrs by car). If you have Lombardia Carta Musei, Parco Nazionale delle Incisioni Rupestri di Capo di Ponte is included in your card (otherwise, ticket is 6€). Parco Archeologico Nazionale dei Massi di Cemmo has a free entrance.

I was very lucky, since - by chance - that day there was a special night opening of Massi di Cemmo and Parco Archeologico Comunale di Seradina-Bedolina, with a guided tour with the Park director, so we could get very interesting explanations. Also, drawings are better seen with raking lights (i.e. early morning, sunset, or night with a raking lamp). 

So, we started with Massi di Cemmo, they're the easiest to see, the park is in the centre of the town (I guess you can also walk there from the station), they are 2 big vertical (drawings are on the vertical side) stones so this saved them from centuries of damages from snows, people walking and so on. Then we started walking with the director and a group to the Seradina Bedolina Archeological area. He guided us to the most important rocks (big horizontal rocks, so carvings are very thin) and talked about the different carvings, he also told that carvings here have different subjects from carvings at Naquane.

Then, on Sunday morning, we went to Naquane (we walked there from our B&B, but there is a small parking lot a few hundred mts from the park entrance). We went there in the morning and I guess we were the first visitors, when we left there were many visitors and some groups.

Carvings here, during the day, are more difficult to see than the ones in Massi di Cemmo and the ones seen during the night, here we have horizontal rocks again. The park is big, with good signs and some wood track to get near to some of the drawings you couldn't reach on your own (it's forbidden to walk on rocks).

Then, we took our car and tried to see Parco Archeologico Coren delle Fate, it's not well signedposted, and it's not clear if you can drive along the road or where the car road ends and you have to park the car an walk. Anyway, at the beginning we ended up in a private backyard, the owner was very kind and gave us explanations to reach the correct place, but warned us that carvings were very light to see (and he was right). Then we tried to visit the Parco Comunale di Sellero, where we were supposed to see rocks and mines. Unfortunately, signs sent us to nowhere (on a very narrow road, until where we found a "private road, no trespassing" sing, and a "no park" sign). So we had to turn back and give up. Later, somebody we met in a local shop, told us you're allowed to visit that park only with guided tour on request (and on payment). (the official site doesn't mention it, since it writes the park is always free and open).

So we came back to Capo di Ponte and visited the MUPRE museum http://www.mupre.capodiponte.beniculturali.it/ (it's included in the Naquane ticket, but it has shorter opening hours) where we could see more rocks with very good lighting, and items found in graves or archeological diggings.

My opinion, about what I could visit, a very interesting site, but very poor communication (i.e. we discovered about the special night opening only because our B&B owner told us, the museum just wrote it locally on some leaflets, nothing on their webpage).

 

(sorry for my poor English)