My daughter has adored World Showcase since she was 2. There are Princesses and other characters all over. Every country has a Kidcot station. They can color an Agent P or Duffy at one and then get a stamp on it from every other country, or you can buy them passports to take around the countries and get stamps. At the KidCot stations, a CM is there from that country that can talk to them about that country. The Donald Duck boat ride in Mexico was a huge hit with normally short lines. When DD was in preschool, she wanted to ride it in circles all day, and we instituted a 5 time in a row limit. DD always liked shopping around those countries even as a preschooler, but then she is a born shopper. She also always liked watching the entertainment acts throughout world showcase- the bands, the juggler, the acrobats. The outpost has an area with African drums where the kids can play the drums and she loved that when she was little. They are a little young for Agent P missions, but they might enjoy the special effects if someone else helps them. I will say though that an evening is in no way enough time to explore WS especially, if you are doing a TS dinner while there. Plus, WS is always more crowded at night with the dinner crowd coming in. Also some of the characters and acts only appear in the afternoon, and early evening hours. When DD was 2, we spent one full day in EPCOT open to close and quickly realized it was not enough time for her. Since then we have spent 2 full days there. The first day, we typically get there at rope drop move to WS at about noon for a TS ADR. After that, we always wind up in WS until park closing. The second day we pick up the things in FW we missed and usually have another meal in WS and pick up anything we missed there which there still are usually some things we did not get done over there. For reference, walking from one end of WS all the way around to the other end is almost a mile.