Arrange the nights first
Spend three nights in Santa Cruz de Tenerife and three in Las Palmas de Gran Canaria. The suggested fast ferry arrives at Agaete, with a road connection to Las Palmas. Check TFN versus TFS on arrival and LPA on departure; include the local journey on each island.
Make the main bookings
Book the Santa Cruz–Agaete ferry with the correct onward road connection. Use TITSA on Tenerife and Global for Gran Canaria journeys. Teide’s PNT10 summit reservation is separate from the cable-car ticket and has applicable fees. Tenerife ON lists trail permissions and conditions, including protected Anaga routes.
If you have fewer days
Stay on one island if the outdoor days are the priority. Choose a base close to your excursions and avoid spending a short trip repeatedly crossing an island just to reach the starting point.
Build the budget from nights and days
The day figures add up to €1,145.00 for one traveller before paid visits and extra journeys. A private-room line buys the whole room; divide only that part when sharing. These are chosen spending allowances, not available room offers or measured averages. Replace the stay amount with the full booking cost, including taxes and cleaning.
Add paid visits, excursions, intercity or inter-island tickets and airport journeys. The day notes separate accommodation, meals, local travel and small extras. The final day has no extra overnight allowance. The city budget cards are an alternative plan, so do not add them on top of this subtotal.