Hi Song,
I haven't done an SIG day program simply because there are no campuses near me. Their programs look great. I would only worry about a 5 yr old's stamina to make the most of a costly program.
We've never had the commuter program choices--only residential. The youngest we ever did was the one week Univ of Denver summer program for 4th-6th graders (Rocky Mt Talent Search/CITY) when my DS was 9 yrs old. Now we're trying the 5th/6th grade program through Jhu cty for my 10 yr old that is 3 wks long.
Good luck with what you decide. I think the summer institutes have been so important for my kids that I highly recommend them.
