If you really want it to be a surprise for her, but also to be fairly 'safe' (ie her not to get into trouble for being naked, and for your friends to be able to say it was just a bit of fun if someone gets upset about it, as well as her being able to get to safety with a minimum risk of anything untoward happening) then how about just going for a normal day out to a swimming pool? It should be no problem at all for your friends to dunk her underwater and get her costume off her when she least expects it (get her in a string bikini, it'll be off in twelve seconds flat, top and bottoms!), then swim off and get out of the pool.
Filming it should be no problem, and it's up to you and your friends how they want to play it from there - but I'd suggest that they shout and point at her, waving her bikini about, then run off to the changing area, so that everyone knows she is naked and she has no choice but to get out and chase after them. If it is one of those places with lockers with keys that go on the little rubber wrist-bands, your friends could always get the key off her as well, then try to get to her clothes before she does, and leave them in a pile at the reception, car park or whatever, so you can enjoy a little streak as well. Or when she comes in from the pool, your friends could always simply push her out of the changing room door, which will probably lead into the reception area anyway, and, if possible, hold it shut on her for a few minutes.
Of course, if your friends really want to strip the poor girl naked, then they must be pretty nasty people - so it would only be fair to arrange to get them back at some time in the future, wouldn't it?
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