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Celtics rookie Kelly Olynyk rides the flume at Canobie Lake Park.SALEM, N.H. -- Boston Celtics rookie Kelly Olynyk said Friday that his plantar fasciitis is improving and he's working with team doctors to ensure he's on the floor for the start of training camp next month.

Olynyk joined forces with the Celtics Shamrock Foundation to host 30 children from the MSPCC for their Friday Fun Field Trip Day at Canobie Lake Park, where Olynyk rode the rides (getting soaked on the flume and Boston Tea Party with team co-owner Steve Pagliuca) and toured the park.

Before the event, he downplayed the foot ailment that prevented him from working out with the Canadian national team this summer and suggested keeping him out of action was merely precautionary.

"[The plantar fasciitis] is improving," said Olynyk. "I just have to keep working to get it better every day, doing things I can do. The [team] doctors here have been great. I just need to keep working to be ready for season."

Olynyk said the plantar fasciitis had been lingering and likely flared after the Orlando Summer League. He still spent a week around the Canadian national team hoping to bond with a young core it has put together.

"They had me in there week or so, just to be and feel a part of it and to have that chemistry and bond," said Olynyk, who noted he hopes to be part of the national team after being in the program in recent years. "I would love to [compete for Canada]. It's a real sense of pride and passion to play for your country and have your country across chest. It's something I want to do in the future."

Olynyk returned to the Boston area on Thursday and his more immediate itinerary calls for him to spend much of the next month working out here while ramping up to training camp in late September. There's also the matter of getting settled, including finding a place to live in the region.

For one day, those rookie chores took a backseat to the amusement park.

Olynyk admitted it has been a whirlwind summer, but said it peaked early when the Celtics moved up to snag him at No. 13 in June's draft. He said the draft and hosting a basketball camp where he grew up in Kamloops, British Columbia, have been the two biggest thrills of the summer.