Things are different this summer. After the challenges of 2020 Arlington Parks and Rec wants all camp registrations done through their site.
You can register for Intro and Middle School camps using this link. Enter in Activity Number 543015
Bayside registration is just a google form:
MS and ES Day Camps: $350 for full day. Extended hours 7-9am and/or 3:30-6pm for an additional $30 per extension per week.
Bayside Overnight Camp: $545 per camper