Oh la la! so i looked up Tenerife and ur going to be in the islands?
Lucky girl!!!! I am sooooo jealous, but u helped me with my Q so im gonna try to help you with urs.
Ok, for swimming....
At least 2 caps
At least 2-3 suits
Baby Powder (for cap drying)
2 pairs of goggles
Fins, paddles, pull bouy, kickboard if they said to bring those things
Hairbrush and special shampoo and conditioner if you use that after you swim
Moisturizer (I like to use a lotion after I get out of the pool because my skin gets super dry and itchy)
Lotsa Towels--in case you forget to hang one up or want some for ur face or something
Board Shorts or other coverup shorts if you want
Athletic shirts and sweatshirts you can throw on to go to the pool.
Any touch up makeup that you use after you get out. If you are really want to, some of my swim friends wear waterproof makeup in the pool but Idk if this applies to you...
Camera--not a neccessity, but some of my fave pics are of me and my swim friends from different camps by the pool
Water bottle you can bring to drink while swimming
For the plane I would just take lots of entertainment
Ipod or iPad if you have one and feel comfertable bringing it. Otherwise you may want to bring calling cards or something.
Cell Phone--to keep in touch with ur friends! Make sure you know if it'll work down there!!!
Notebook and pen--so you can write if you want about the trip, but also for the swimming if you are going to have lectures or you want to write down ur new friends names
Pillow and Blanket
Headphones--even if you don't bring an iPod, you can put them in if someone on the flight is like snoring really loud or something and annoying u.
Money, if you want something from the little cart thingy the flight attendents push around.
Edit- Okay, I thot of some more stuff.
if you are going to be doing any dryland, I would pack shorts and shirts you can run in, tennies, socks, and a sports bra if you want it.
Swim Bag--u don't want to lug ur suitcase to the pool!!!
Flip Flops u can wear to the pool
Xtra straps or nosepiece for googles--optional
Gum for the plane (so ur ears don't pop!)
Rubber bands or retainer if you have braces or something
Sunscreen--if you're gonna be outside
Earrings u can swim in. Diamonds and sparklys dull in the pool!!!!
I'll see if I can think of anything else but b4now!
Hope I helped and have an awesome day!