Kattila is a popular starting point to Nuuksio national park because it has public transport (bus line 85A) available in summer. If hiking south from Kattila you will reach Haukankierros trail which is quite used by people leaving from the most popularstarting point of Haukkalampi.
In early September I walked from Kattila through connecting routes clockwise towards Haukkalampi and then made a visit off the main trails to lake Iso-Holma and its fire sites. The trail to Iso-Holma from the main trail is not marked but is very visible. Iso-Holma northern fire site has a lot of tent places around, I guess it is quite popular with scout and other groups. This time on only two groups of day visitors were around.
September forest and weekend had attracted quite many people in rubber boots and with their bark baskets searching for mushrooms. For more info about Nuuksio national park, visit here.