Tiskita: It was incredibly beautiful, a great combo of nature and beach. Very few misquitoes, though there were some knats. Arenal Lodge: we were actually very surprised as the wildlife viewing was exceptional there (we assumed the experience would be all about the volcano - not the wildlife.) We kept stumbling over wildife everywhere we went. We even saw a Coyote grab a Coatimundi from their pack and run away with it in its mouth , a National Geographic moment.
Everything was on schedule. Our long distant transports were always early, and the drivers seemed to be insulted if we were waiting for them beforehand - i.e. they seemed to take pride in their work ethic regarding this, which is bizarre as you will never find this in the US !! This was my second trip to Costa Rica. The first time I rented a car, and swore never again (because of the roads and lack of signs!) Having people drive us around worked out perfectly.
Overall, the tour was great, probably in part b/c it really was a personalized tour (just two people), and because Mario was very accommodating.
Tiskita is run by Peter and Lisbeth who are fountains of knowledge, and extremely friendly. They constantly went out of there way to make us feel really welcome on their property (again, in the US this rarely happens!). For the rest of the trip, we had Mario - who was also very friendly and enthusiastic. I had my concerns before I scheduled this trip, because my professional experience is fairly close to the level of knowledge of a lot of the nature guides, but I learned a great deal with Mario, as he adjusted to my level. He is very experienced. I think we ran him a bit ragged trying to identify stuff, but he was a good sport. Also, we appreciated that he went WAY out of his way to show us stuff.