jaluit - there is a ton to do in Samara.

For surf lessons, I'd probably recommend Choco's but there are certainly other options in town.

http://www.chocossurfschool.com

You can also do a great canopy tour in the hills above Samara, operated by Wingnuts. Their website isn't working, so look here instead:

www.samarabeach.com/wingnuts/index.html

If you are interested in seeing Dolphins or snorkeling, I'd look into Tio Tigre - I have had good experiences with them:

http://tiotigretours.com/our-tours/

Of course, you can rent horses, go hiking, or explore the nearby beaches - such as Carrillo, Buena Vista, Islita, Camaronal, etc.

If you want to go farther afield, there's Barra Honda National Park where you can go caving:

costarica-nationalparks.com/barrahondanation…

Depending on the season, you can watch the Arribada of Ridley Turtles in nearby Ostional.

http://www.nicoyapeninsula.com/ostional/

Hope this gets you started...