This is pretty vague, but here goes:

If you're in the Quepos area, head out of town like you're going to
Manuel Antonio. Just as you leave town you'll start heading up a steep
hill and you'll pass a hotel called the Mono Azul (Blue Monkey). Take
the next right, right past the hotel. About three houses down there's
a sign on the left that says "Rio Savegre Sportfishing". They'll take
you to the the mouth of the Rio Savegre and drop you off - their boat
is not suitable for flyfishing. Ana and Gallo - they are super nice.
It'll cost you about $80 and it's worth it just for the trip to this
somewhat remote river mouth. It helps to speak a little Spanish.
Gallo and Ana will fish the entire time with spinning rods and they'd
appreciate any larger spinning lures you can bring them.
Bring a 9 or 10 weight and a fast sinking line so you can fish deeper
without trying to cast a super heavy fly. The fish were chasing a
bunch of little jacks around when I was there but it was a different
time of year. Might as well tie some 4-6" light colored baitfish
imitations anyway. Awesome place. bruce h