We are using Landscape Structures, too. They have some designs that are pre-configured for the 2 to 5 year old age range, and then they have design-your-own possibilities, too. Our school is getting a sp.ed. preschool, and so I helped pick out some of the things that are going on that playground... I really liked their Thunderhead Climber-- it functions as ADA accessible stairs and transfer point station, as well as a fun climber. Then on the underside of it, it has cave motifs with handprints and animals, so kids can play both on top of, and under it. It is also large enough so that a good number of preschoolers can fit on it at one time. We also used a Cozy Climber, which is a curved climber that has the slats close enough so that their shoes and feet can't slip through. And we did a slide, and also a store-front window because the preschool teacher said that on their current playground, the kids love to pretend to sell ice cream and so forth there. Landscape Structures has a lot of other great climbers that are low to the ground for toddlers like the Critter Climber, block climber, ABC climber... lots of possibilities. I really liked the variety that this company offered and it was fun to help pick out the preschool playground stuff because there was so much to choose from! Their website is www.playlsi.com
and then you can find the dealer/vendor in your area and they will mail you a catalog to look at for free (and come out and meet with you, work out a design, etc.).