way too many ideas.
answer these questions and i will give my $0.02
ice or rock? alpine?
sport or trad or aid? or even only bouldering?
do you speak french or spanish or italian or just english?
when is spring break?
wanna go someplace unique or someplace popular?
but i think the train thing will be a problem. rope some other folks into it and rent a car for $20 a day.
my first thoughts: el chorro, buoux, verdon, calanques, ceuse, finale, the place in switzerland, croatia, greece, bleau, chamonix...