On my former page of Timmendorfer Strand (2007) I've put "Sea Life" among the tips of "things to do". Up until today I personally haven't visit "Sea Life" though I do spend time in Timmendorfer Strand once in a while. Seems "Sea Life" is yet not really "a must do" thing (to me), however if you like, please, check out for yourself. Link below. On the photo I took, it's the blue building far behind (in the left corner). "Sea Life" at least makes a good bad-weather option, I trust.
"Discover the fascination of the underwater world at SEA LIFE Timmendorfer Strand – from mussels to sea horses, starfish and jellyfish to sharks and rays to otters."
TIMMENDORFER STRAND SEA LIFE CENTRE
Timmendorfer Strand, 23669