The lockers are well worth it. We climbed the falls last year, and had so much fun we did it twice. You have probably seen pictures of the chains of people holding hands climbing the falls. I found that by holding hands with a guy in front of me and my husband holding my other hand I almost got pulled in half! I felt much safer just holding my husbands hand! We wore those "aqua sock" shoes and they worked great. Try to stay on the route that most climbers take, because the algae is worn off the rocks. The rocks that do have algae can be very slippery. The only downside to the trip was that to leave the falls you have to walk through the vendor area, and the people are all so desperate to sell you something that it is very hard to walk through . Have a great time - get yourself one of those cheap waterproof cameras so you can take pictures while you climb!