V.F.
Are you looking for 'city' things to do, or 'country' things to do?
Santa Fe is good for walking around and looking at the old city buildings.
El Rancho de las Golondrinas - is a living history museum located on 200 acres in a rural farming valley just south of Santa Fe, New Mexico. The museum, dedicated to the history, heritage and culture of 18th and 19th century New Mexico, opened in 1972.
Santa Fe has many art museums, and a children's museums.
As for the outdoors.... There are many options for hiking near and in Santa Fe. You can take short drives from town to get to many trail heads.
From Santa Fe, a 45 minute drive will get you to Bandelier National Monument - which more hiking, and scenic cliff dwellings.
For adults (not your question, but if you have the chance) there is a spa called 10,000 waves - that is quite nice.
July and August tend to be warm for NM - so temps in the upper 90's would be expected. They are also when we get a bunch of our annual moisture - so (depending on the year) there may be daily afternoon thunderstorms. That said, in NM it is almost never cloudy all day - the storms show up, drop rain, and move on. Layers of clothing are a must. :)
I live a bit North of Santa Fe, so PM me if you have specific questions. :)