Jaco

Jaco is less safe than many other areas of Costa Rica.  It's a tourist town so small time thieves do well there.
Internet reception is good through crwifi. 
It's also a "surfer dude" or wanna-be surfers town.
Yep, a lot of ex-pats; but, keep in mind this is more of a tourist, party town.  So if you like that environment....
Plenty of amenities?  That is 100% opinion, my opinion, nope.
Organic fruit - that one I don't know.  But, if someone tells you they're selling organic fruit/veggies, no way to know.  It's like most things, it's not really regulated.
Satellite/cable tv, yes.
Bars and restaurants - yes, more than most areas.  You would need to visit there for a while to see if it fits you.  It's a drunk, party town.
Local beer - equivalent of about $1.  Non-CR beer $4 plus.
It's also waaaaay too hot for me.  I like cool nights.

Keep in mind, this is "my" opinion of Jaco.  Others might love it and think it's the greatest place.  Stay for a while and decide for yourself.
- Dave

Yeah...organic produce and Jaco  doesn't go together.

Agree with the previous poster.

Nearest beach town to San Jose and is always full of working women...