I live at the base of Little Cottonwood Canyon as you head up the mountain. I love the summer. There are alot of hiking trails in the Cottonwood and Wasatch Front. There are books available Hiking the Wasatch Front for example. You have 3 canyons in the Salt Lake Valley. Milcreek, Big and Little Cottonwood Canyon.
The tram at Snowbird is open during the summer and they have some rides up there. The eating facilities are limited. I would go grocery shopping on the way up the canyon. If you are flying in, you will need to rent a car. Take I15 to 90th south. Go east or left off the freeway. Stay on that road it will curve to 94th south and stay on that road. Abouth 20th East you will hit 2 grocery stores that have good prices and you should buy your groceries there. If you are a member of Costco. We have 2 Costco's on your way. There is a Blockbuster there too for movies.
Snowbird isnt very busy in the summer. Its a slower time. Ive stayed at the Cliff and like that better but the Iron Blossom is nice. It has more cement showing. I was able to get a few rooms at the Iron Blossom for people coming in for my daughter's wedding, so Ive seen the inside rooms but have only stayed there once. As I remember, if you have the unit with the loft then there are 2 queen size beds in the loft. I think 2 queen beds in the room downstairs and maybe there is a murphy bed in the living room. There will be a balcony out the living room and large windows that look towards the ski resort. If you keep the windows open there should be enough air flow to keep things cool at night. It gets warm during the day. We go camping during July at Tanner's Flat (which is close to Snowbird) and it is comfortable at night.
You should do a day trip to Park City, its about a 45 minute drive from Snowbird. There are more restaurants and activities. You could do a day trip to downtown Salt Lake but the city center is under construction. You can get the LDS Temple area which is interesting. There are many restaurants and shopping in the Gateway area.
If you have more specific questions, ask away. There are a number of people who live in the Salt Lake area on Tugs or email me. Have fun....