I agree with the previous poster's opinion that the Clifton Hill attractions are very expensive - we bled money the two days we were in NF. For activities and entertainment you will easily spend $500.00 in a weekend (not including food or lodging).
The price for Marineland was $45.00/day p.p. plus tax.
Be prepared to walk or shuttle to Clifton Hill where it is impossible to find parking, and to the Falls where it costs $13.00/day to park.
Just a few things to add....hope this might help
Brighteyes in planning her trip to Niagara!
We just returned from five night/six days at the Falls.
If you are going to do Clifton Hill attractions, consider getting one of the combo passes. There's a great one that includes admission to the Skywheel (which I highly recommend), either Dinosaur or Cosmic mini golf (both tons of fun....particularly Dinosaur Golf, which has some great photo opportunities), tokens for the Great Canadian Midway, Movieland Wax Musuem (another fun place with great photo opportunities), and tickets to the Ghostblasters & FX Theatre rides (cheesy but will be liked by a 13 year old). Buying the pass will save you $30 per person. The Niagara Parks Commission sells a similar pass for their attractions (Maid of the Mist, Journey Behind the Falls, White Water Walk, & Niagara Fury), and Ripley's also offers a combo pass (the Believe it or Not Museum, Moving Theatre, & Tussauds Wax Museum....works out to a buy 2, get 1 free savings). So discounts CAN be found, you just have to figure out what you want to do and start hunting from there.
Lots of coupons available online as well. There are a couple of additional attractions booklets on Clifton Hill which offer coupons for various attractions, plus the ttractions Ontario website has some to download and print. A $1 or $2 off here and there may not seem like much, but sure adds up after doing 10 different things in a couple of days!
Also, the price that ronandannette quoted for Marineland is for a
season's pass. The one-day price is $39.95 plus tax. The season's pass is a great deal as the extra $5 allows you to come back as many times as you want for the rest of the season. We spent 2 part-days at Marineland with the passes (June 29th and 30th) and walked right on EVERYTHING. Absolutely no crowds whatsoever!! I don't know whether we got lucky, whether its the state of the economy, or ??? . But man, it was way less busy than we expected. And your 13 year old would LOVE it there. The two 13-year-olds we had with us had a ball. Feeding the belugas is an extra $8 per person, and fish/bear/deer feed will also cost you as well ($2 or $3 each time).
We also had
no problems getting parking in the Clifton Hill and Falls areas (and we were even there on the July 1st holiday). Some lots are pricier than others, so choose wisely if cost is a concern.
Brighteyes, one reasonably-priced hotel you may want to consider is the Travelodge on Clifton Hill. They offer packages that include some attractions you have spoken of (Marineland, Clifton Hill, etc.). They have an outdoor pool, a fridge and microwave in every room, they are located right on Clifton Hill (walk to the Falls!!), parking is included, and breakfast is included at Ruby Tuesdays (and its not bad....we stayed here last year and had no complaints). They were also pretty friendly folks to deal with.