I would quite like the Swan Boats back, Alton appear to have a lack of decent water rides. I'm not even going to count Battle Galleons as I've been mid-summer and still not fancied it, and the flume's a bit old, and will probably soon be gone for refurbishment, and woe betide those who count Charlie as a decent water ride!
That just leaves Congo River Rapids and Ripsaw, but these are both old, and can't have much more than 10 years on them. Bringing back the swan boats is actually a very good idea!
Burniel | Great at theme park knowledge, not so great at designing signatures.