I'm leaving next week for a Panama Canal cruise. We tried to get horseback riding scheduled in Costa Rica, but needed four people and we were only two. Couldn't find anyone else interested (we'll be the only ship in port that day and usually that's a good thing--unless you're trying to find someone else that's interested in doing something specific!), so had to go with something else. If there are four or more of you to go, it looked interesting. Here's the information link:
Hope you have more choice through the canal that we do. Ended up with only one option for a tour--a Lake Gatun tour--which we booked and then had it cancelled on us! Bummer! We do want to see and experience the locks, etc., in the canal, but figured we'd have time to do that AND an optional tour. Guess we'll hit the mini-golf course. Shouldn't be too rough through the canal!