Try using the search engine first next time before posting a question.
Here is a link to thread on scuba diving including a VERY detailed post I made which included a link to a dive outfit in Quepos and reference to the existent but relatively poorer quality dive opportunities in Jaco.
http://www.costaricaticas.com/phpBB2/viewtopic.php?p=34847&highlight=scuba#34847.
Here are some on fishing in Quepos.
http://www.costaricaticas.com/phpBB2/viewtopic.php?p=39914
http://www.costaricaticas.com/phpBB2/viewtopic.php?p=38624
http://www.costaricaticas.com/phpBB2/viewtopic.php?p=36873
There are many many more on fishing in Jaco and other areas. In fact if you reviewed the introductory info on this site you'd know that one of the this board's sponsors is a Jaco fishing charter outfit that offers 10% discounts to VIP members.
As for Flamingo and Tamarindo, your question is too open-ended, as the number of search results on various aspects of those beach areas are too numerous to list here.
Trying searching, browsing and READING and THEN post any questions you might still have.