We will have only one full day in the Arena area - July 20th- and want to see and do the best of the area. We are staying at Hotel Kokoro without a vehicle. We are an adventurous family of 5 with 3 older kids (17, 18 and 21). We will be visiting Sky Trek in Monteverde, so we don't plan to zip line in Arenal. If you only had one day in Arenal, what would you do?