There are a couple of posts in the forum regarding the monkey park. You will find them at the following

http://www.holidaytruths.co.uk/viewtopic.php?f=26&t=108651

http://www.holidaytruths.co.uk/viewtopic.php?f=26&t=107236

Hi yes
We have just returned from a week in Tenerife. We had an excellent time and actually went to the monkey park twice!!
The main reason for this was that it was very close to Las Americas about 8mins in the taxi (which cost about 8 euros) and the interaction with the monkeys and parotts was fantastic!
My children preferd this monkey park to the larger Jungle park as you can actually touch and feed the monkies there.
I would say take some fruit with you as the monkeys tend not to eat the dry food that they sell there, they much prefer fresh bannanas and apples etc!!!!
Think it cost about 10 eurs each to get in and under 4 's free.
Hope this helps. PLease dont hesatate to get in touch with me if you have any other questions.