If you like a challenge are into hiking, you could try letterboxing. I can't remember the website, but could google "letterbox" and see what you come up with. It's really fun and my kids LOVE it. Friday August 1st is get into the Clark County Fair free day. If you ride Ctran, that is free as well and they drop you right at the front gate and pick up there every 10 or 15 minutes as well. I think you may need a coupon from Fred Meyer to get in free. Plus, they have a free pancake breakfast, but warning, the line is really long unless you get there really early. Also, each evening there are events that are included in the entry. The last weekend, there are monster trucks that are fun and LOUD to watch. I like to park at Lloyd Center and ride the Max for free to downtown either on a Sat or Sun for Saturday market or just a weekday to walk around downtown and go to Pioneer Courthouse Square. I think they even have mid week free music around lunch time for a nice picnic spot. I babysit and the kids and I ride bikes everywhere all summer to parks that are within a couple miles and we are near the new Sonic here in East Vancouver. They have 1/2 price drinks from 2-4 and a great park right across the street. It's the new old style drive in, with waitstaff on roller skates and no indoor seating. Kinda fun, plus right now, they have $.99 milkshake special right now. It is not posted anywhere and you just have to ask for the $.99 milkshake special, regular $2.59. The free movies begin at 10 am, Regal theaters around Portland on Tues and Wed, maybe Thurs at select places., maybe more variety on times and days, but that's what I remember from last summer. Make a day at the zoo, ride the train to the rose garden for a picnic and walk, great park just a short walk from the train, then take it back for a finish up at the zoo, and if you did it on a Wed, free zoo concert at 7 for the evening. Could be a spendy day, but a lot of fun, and not bad if you pack all your food and refill water bottles. I know there are several parks throughout the Port/van area with free noon time/evening concerts or movie viewing so I am sure you could find that on line somewhere. Esther Short Park in downtown Portland has wed noon concerts for free and evening ones I think on wed or thursdays. It's a great park with a water feature, large play area, ampitheater style concert area - it is one city block, all open with a small rose garden as well. Plus they have a great sat/sun market there as well. Not as crowded as the Portland one, but great local stuff and it is growing. :) That's all I can think of but there is a TON of stuff to keep you guys busy, and maybe even wear you out. ;)