Parking options

Hi everyone, i have booked The Sutton Place Hotel for 12,13,14 july. We are travelling with 2 kids (1.5yo and 7.5yo). We coming from New Zealand (1st time visit to Canada)

We planning to visiting 3-4 places from this list: Stanley park/aquarium Seawall Science world Grouse mountain Squamish sea to sky whistler (shannon falls and porteau cove) Pacific spirit regional park Lynn valley Coal harbour West end

I really wanna do the drive to Whistler or at least to Squamish. What are our options if we dont rent a car for our travel? Is it gonna be too much hassle with little ones? And if we do rent a car, i see parking at Sutton overnight is like $55 which is so expensive. Are there any cheaper parking options?