The jungle hike was nice and the ruins were OK, but it was clear that the Guatemalan government wasn't spending much money on site maintenance. Some of the trails were completely overgrown. All in all the trip to El Ceibal was fine, but was not as nice as the locals suggested. We didn't go to Aguateca or Dos Pilas, after El Ceibal, it didn't seem worth the effort or money. There are other river trips available, but do your research at home and make up your mind when you get there.
Camping is available.
The view across the lake, to the volcanos and the colorful sunsets are worth it. I've done it twice and would do it again. This is also a good place to shop for Tourist stuff. This area is also good for shopping. The Museum of Anthropology is excellent and there are other sites worth seeing.